7 ms·

Why did the flu also disappear in the states that had effectively no covid restrictions? This is a serious question and not an attempt at rhetoric. I really am

by User23 6y ago

Why did the flu also disappear in the states that had effectively no covid restrictions? This is a serious question and not an attempt at rhetoric. I really am curious. Was flu never a problem in Florida? Was voluntary compliance so widespread that heavy handed government policy had no marginal anti-flu effect? Something else?

brandon272 6y ago
The likely explanation is that, because the flu is significantly less transmissible than COVID, even states with "no restrictions" were able to knock it out because enough people took enough measures to protect themselves from airborne/surface communicable disease in general. In other words, you can probably beat back the flu significantly by having enough of the population mask up, wash/sanitize their hands, etc.
- ericcholis 6y ago
  Also, I wonder if there is correlation of at-risk people getting more flu shots?
  - brandon272 6y ago
    Not sure what the case is overall, but apparently in North Dakota, where flu cases were 1/65 of what they were the year prior, flu vaccinations are only up 5%: https://kfgo.com/2021/04/29/319613/ https://kfgo.com/2021/04/29/319613/
- petertodd 6y ago
  > The likely explanation is that, because the flu is significantly less transmissible than COVID But why is it less transmissible? One obvious explanation is because we've lived with it all our lives, and most people already have some level of pre-existing immunity to most flu strains they're exposed to. Both due to natural infections, and vaccines. > In other words, you can probably beat back the flu significantly by having enough of the population mask up, wash/sanitize their hands, etc. If pre-existing immunity is why it's less transmissible, those measures will result in fewer flu infections, and thus lower levels of pre-existing immunity. Which in turn, may make the flu more transmissible, leaving us where we started. Worse, if pre-existing immunity is decreasing the severity of the infections we do get, the net effect may actually be more deaths due to fewer, but more deadly, infections. Flu vaccines are notoriously ineffective, with a typical year being just 50% effective, and bad years being as little as 19%. They're probably the least effective widely used vaccines by a long shot (eg the MMR vaccine is about 97% effective). So we can't just assume we'd be able to make up the difference with increased vaccination. Flu vaccine coverage is already quite high anyway, 51.8% or so for the entire US population. edit: fixed % https://www.cdc.gov/flu/fluvaxview/coverage-1920estimates.htm https://www.cdc.gov/flu/fluvaxview/coverage-1920estimates.ht... https://www.cdc.gov/vaccines/vpd/measles/index.html https://www.cdc.gov/vaccines/vpd/measles/index.html https://www.cdc.gov/flu/vaccines-work/effectiveness-studies.htm https://www.cdc.gov/flu/vaccines-work/effectiveness-studies....
  - khuey 6y ago
    Your link says that flu shot coverage is 51.8% for all people over 6 months of age. The 64% number is for children. Flu vaccine effectiveness is not great because they have to "guess" which variants of the flu will be most prevalent months ahead of time due to the manufacturing lead times. A lot of experts are optimistic than the mRNA vaccine technology will lead to more effective flu shots.
    - petertodd 6y ago
      Thanks! Fixed. > A lot of experts are optimistic than the mRNA vaccine technology will lead to more effective flu shots. We will see. Influenza is unusual in its ability to evolve new variants that resist existing antibodies. It's also not clear that we even can give people repeated mRNA vaccine shots year after year. People quite often develop antibodies to glycol, which makes up the nanospheres used to get the mRNA into cells. Repeated shots may lead to severe side effects, and/or the nanospheres being destroyed before the mRNA can be delivered, rendering the vaccines ineffective. Incidentally, this is also a problem with the new adenovirus technology used in the Astra Zeneca and Johnson & Johnson vaccines: your immune system develops antibodies to the carrier virus as well as the target proteins. Subsequent shots with the same adenovirus can be destroyed prior to being able to get into cells and express the desired protein; there isn't an infinite supply of suitable adenovirus strains. The Sputnik V vaccine actually uses a different adenovirus for the first and second shots for this reason.
      - selimthegrim 6y ago
        I think this was only a problem with the HIV adenovirus vaccines.
  - joshuamorton 6y ago
    That's not at all an obvious explanation. There obvious explanation is that different diseases have different levels of infectiousness. It just so happens that the symptoms the flu causes make it less virulent than covid-19.
  - 6y ago
- moftz 6y ago
  I remember it not being a huge deal to have a bunch of people at work come with flu-like symptoms. "It's just something going around." Work gave out flu shots every year but that isn't 100%. It wasn't even considered much of a faux pas to show up to work feeling a little ill. Now, showing up to work with flu-like symptoms could put you in the hot seat with HR. Having a bunch of people fall ill in the office now results in it being closed for the day for cleaning. It won't stay this way forever but it's going to be a while until most people go back to being lax on contagious diseases. Imagine companies forcing employees and schools forcing students to mask up during flu season.
  - ggggtez 6y ago
    One time I was really sick at an airport McDonalds. Fever, sneezing, the whole thing. But you're in an airport, and you have to eat something. I had to explain almost pedantically why they should allow me to order verbally instead of using their touchscreens, for the safety of the other customers. I think today, they'd have a protocol to accommodate people who are obviously sick so they don't have to touch anything. In fact, they probably don't even let healthy people use touch screens, if I had to guess.
    - hombre_fatal 6y ago
      You didn’t think of just washing your hands and maybe using a knuckle to touch the screen instead of going HN pedant on the $7/hr worker? Besides, I would think shooting mucus debris in their direction by talking is worse than using a cleaned knuckle on a screen far away from them.
      - ggggtez 6y ago
        So, in your expert medical opinion, given years after the fact without any understanding of the illness in question... You think that your advice that "you should just have washed your hands" is such amazing advice that you think it's worth writing here? What are you hoping to gain? And even if you were right, as I said, I had a high fever. It's not like I was thinking clearly. Are you trying to feel morally superior to someone who was in gravely ill?
- epmaybe 6y ago
  I'm really hoping that the culture change in the US is to wear masks in public when feeling ill from a respiratory infection.
  - txsoftwaredev 6y ago
    Better yet just stay home.
  - mindslight 6y ago
    I'm really hoping that the culture change in the US is to wear masks in public to thwart facial recognition.
  - heavyset_go 6y ago
    Not wearing masks is a hill many people have chosen to literally die on, so while I hope that there is a culture change, I expect that anyone wearing masks after the pandemic is over will be demonized.
- peder 6y ago
  But the flu has always been here, even when our country was significantly less populated, when we were significantly more rural, and when people were significantly less connected in many ways. Like, how did we get flu pandemics in the 1700s? Weren't we less connected back then, even after you account for all the social distancing that was done this year?
  - heavyset_go 6y ago
    > Like, how did we get flu pandemics in the 1700s? Germ theory of disease didn't exist back then.
  - mountainboy 6y ago
    The flu (influenza) has been linked to solar radiation and electricity. -- quote -- In 2001, Canadian astronomer Ken Tapping showed that the influenza pandemics over the previous three centuries correlated with peaks in solar magnetic activity, on an 11- year cycle. It has also been found that some outbreaks of influenza spread over enormous areas in just a few days – a fact that is difficult to explain by contagion from one person to another. Also, numerous experiments seeking to prove direct contagion through close contact, droplets of mucus or other processes have proved fruitless. From 1933 to the present day, virologists have been unable to present any experimental study proving that influenza spreads through normal contact between people. All attempts to do so have met with failure. -- end quote -- source: https://www.5gexposed.com/wp-content/uploads/2019/04/English-Summary-of-The-Invisible-Rainbow-A-History-of-Electricity-and-Life-3.pdf https://www.5gexposed.com/wp-content/uploads/2019/04/English...
    - somebodythere 6y ago
      5gexposed.com is not really a reputable source. Anyway, > Also, numerous experiments seeking to prove direct contagion through close contact, droplets of mucus or other processes have proved fruitless. > From 1933 to the present day, virologists have been unable to present any experimental study proving that influenza spreads through normal contact between people. All attempts to do so have met with failure. This is just demonstrably false. https://www.ncbi.nlm.nih.gov/pmc/articles/PMC3682679/ https://www.ncbi.nlm.nih.gov/pmc/articles/PMC3682679/
jcims 6y ago
>Why did the flu also disappear in the states that had effectively no covid restrictions? Where are you getting this take? Life in the US in 2020 is dramatically different than it was in 2019.
kgin 6y ago
Large indoor gatherings, indoor restaurants, bars, were shut down for months. Grocery stores enforced or at least encouraged their own mask policies. What’s more in Florida, those few steps covered almost all the ways people really interact there. Like much of the US, there is almost zero spontaneous sharing of space outside of bars, restaurants, stores and churches. I personally dislike the isolation of extreme car culture, but it does help in situations like this.
- shakezula 6y ago
  I never really thought about how America's aversion to public transit could be a positive in a pandemic. Interesting point.
deleted 6y ago
[deleted]
ska 6y ago
> states that had effectively no covid restrictions? This isn't really true anywhere, some places had fewer state mandated restrictions, but effectively everywhere had significant changes in terms of breadth and depth of person-to-person contacts.
ericb 6y ago
I was in Florida two weeks ago--Orlando and Sarasota. I'm a Massachusetts resident. In Florida, I observed around 90+% mask usage in grocery stores. In a random ColdStone creamery, I saw maybe 70%, Five guys was probably 80% except while eating. In Massachusetts, usage is certainly higher, but maybe in practicality, not enough to make a difference compared to other factors?
- Kiro 6y ago
  1% mask usage in Sweden and we also have extremely low flu numbers.
  - ericb 6y ago
    Interesting. Do people still associate indoors in large numbers, or is that unchanged as well? As in, could behavioral change be a driver? I also wonder, with far less numerical opportunity to spread and mutate, if the flu wasn't able to "grow" a good candidate with good evolutionary fitness this year, so distancing and mask usage affect countries even where they aren't practiced.
    - Kiro 6y ago
      No, we have other restrictions and recommendations resulting in various degrees of social distancing. Definitely less than countries that did lockdowns but it's probably as you say a combination of our own measures and other countries' more rigid restrictions (including masks) killing off the international transmission routes. So we should be thankful that other countries took this more seriously if that's the case.
jsight 6y ago
You seem to be implying that Florida had no restrictions, but this just isn't the case. Even when I went a couple of months ago, masking indoors was the norm and most places still had capacity restrictions. Queues at popular sites were socially distanced outdoors as well.
CorrectHorseBat 6y ago
Apart from what others said. Flu is seasonal and (most of the time?) starts in Asia. With very restricted international travel flu simply has less possibilities to come over.
Jabbles 6y ago
Flu disappeared globally. With no incoming cases, it would have had to spread simply by internal transmission, which by definition would be less than usual. Also, there were probably minor restrictions people took upon themselves, like staying home when they had flu-like symptoms, or shunning people that coughed.
tedunangst 6y ago
Short answer is that photos of people on the beach are an incomplete representation of the situation in Florida.
DanBC 6y ago
Flu is seasonal, and there are large pushes to get people vaccinated against flu each year. Sometimes those vaccinations are more effective, and sometimes you get more people vaccinated. This season it appears both are true.
- failwhaleshark 6y ago
  It's only seasonal because of increased indoor/outdoor humidity permitting longer micro-droplet aerosol suspension. If everyone were wearing masks that trap micro-droplets, then flus and colds effectively die out. It's the no maskers and chin-guarders that cause infectious agents like SARS-CoV-2, flu, and colds to proliferate.
jMyles 6y ago
The notion that horizontal interdiction is responsible for this suppression is absolutely, positively absurd and will never stand up to scrutiny. On the other hand, this patterns very neatly with previously observed and well-documented phenomena of viral interference, specifically with respect to influenza. Here's a good paper to start a journey of research on this topic: https://academic.oup.com/jid/article/212/11/1690/2911897 https://academic.oup.com/jid/article/212/11/1690/2911897
- hvac 6y ago
  Norovirus was also decimated last year, and it doesn't infect the same organs/cells as respiratory viruses: https://www.cdc.gov/norovirus/reporting/norostat/data.html https://www.cdc.gov/norovirus/reporting/norostat/data.html
  - jMyles 6y ago
    Sure. I think it's plausible that widespread surface sterilization is responsible for suppression of fomite transmission.
caturopath 6y ago
1. All places had COVID responses, even places that didn't have state-wide rules. I doubt that there were any real number of Americans -- even in isolated communities -- whose lives were not impacted by public health stuff during COVID. 2. Having flu outside your border be rarer means less flu coming in.
cm2012 6y ago
It's pretty huge that people with cold/flu symptoms now stay home or mask up. People used to just cough and sneeze everywhere.
pmontra 6y ago
A single data point: I didn't get flu once since I went self employed and started working from home most of the time in 2006. Less public transport, less open space offices, less restaurants at lunch time. Maybe a coincidence but if people had less chances to meet other people, maybe because those other people kept social distancing, then they had less chances to get flu. It's way less contagious than covid to start with.
rsynnott 6y ago
Behavioral change. Flu is generally less infectious than covid, so it will take less voluntary behavioral change to get the flu R-number below 1 than the covid one. Also, the whole hand-sanitiser-everywhere thing, while in retrospect probably not super effective against covid, would be expected to be quite effective for the flu.
lkbm 6y ago
There are a bunch of contributing factors (most schools, indoor public places, and workplaces encouraging or requiring masks, and many workplaces remote), but one thing that I'd expect to help with flu much more than it does with COVID-19 is sick people staying home. Asymptomatic spread is a much larger risk with COVID-19 compared to the flu. A simple behavior change of "If I feel sick, I don't go to work/school/grocery shopping" isn't enough to stop COVID, but could cut flu spread a ton by itself.

by User23 6y ago

brandon272 6y ago

The likely explanation is that, because the flu is significantly less transmissible than COVID, even states with "no restrictions" were able to knock it out because enough people took enough measures to protect themselves from airborne/surface communicable disease in general. In other words, you can probably beat back the flu significantly by having enough of the population mask up, wash/sanitize their hands, etc.

ericcholis 6y ago
Also, I wonder if there is correlation of at-risk people getting more flu shots?
- brandon272 6y ago
  Not sure what the case is overall, but apparently in North Dakota, where flu cases were 1/65 of what they were the year prior, flu vaccinations are only up 5%: https://kfgo.com/2021/04/29/319613/ https://kfgo.com/2021/04/29/319613/
petertodd 6y ago
> The likely explanation is that, because the flu is significantly less transmissible than COVID But why is it less transmissible? One obvious explanation is because we've lived with it all our lives, and most people already have some level of pre-existing immunity to most flu strains they're exposed to. Both due to natural infections, and vaccines. > In other words, you can probably beat back the flu significantly by having enough of the population mask up, wash/sanitize their hands, etc. If pre-existing immunity is why it's less transmissible, those measures will result in fewer flu infections, and thus lower levels of pre-existing immunity. Which in turn, may make the flu more transmissible, leaving us where we started. Worse, if pre-existing immunity is decreasing the severity of the infections we do get, the net effect may actually be more deaths due to fewer, but more deadly, infections. Flu vaccines are notoriously ineffective, with a typical year being just 50% effective, and bad years being as little as 19%. They're probably the least effective widely used vaccines by a long shot (eg the MMR vaccine is about 97% effective). So we can't just assume we'd be able to make up the difference with increased vaccination. Flu vaccine coverage is already quite high anyway, 51.8% or so for the entire US population. edit: fixed % https://www.cdc.gov/flu/fluvaxview/coverage-1920estimates.htm https://www.cdc.gov/flu/fluvaxview/coverage-1920estimates.ht... https://www.cdc.gov/vaccines/vpd/measles/index.html https://www.cdc.gov/vaccines/vpd/measles/index.html https://www.cdc.gov/flu/vaccines-work/effectiveness-studies.htm https://www.cdc.gov/flu/vaccines-work/effectiveness-studies....
- khuey 6y ago
  Your link says that flu shot coverage is 51.8% for all people over 6 months of age. The 64% number is for children. Flu vaccine effectiveness is not great because they have to "guess" which variants of the flu will be most prevalent months ahead of time due to the manufacturing lead times. A lot of experts are optimistic than the mRNA vaccine technology will lead to more effective flu shots.
  - petertodd 6y ago
    Thanks! Fixed. > A lot of experts are optimistic than the mRNA vaccine technology will lead to more effective flu shots. We will see. Influenza is unusual in its ability to evolve new variants that resist existing antibodies. It's also not clear that we even can give people repeated mRNA vaccine shots year after year. People quite often develop antibodies to glycol, which makes up the nanospheres used to get the mRNA into cells. Repeated shots may lead to severe side effects, and/or the nanospheres being destroyed before the mRNA can be delivered, rendering the vaccines ineffective. Incidentally, this is also a problem with the new adenovirus technology used in the Astra Zeneca and Johnson & Johnson vaccines: your immune system develops antibodies to the carrier virus as well as the target proteins. Subsequent shots with the same adenovirus can be destroyed prior to being able to get into cells and express the desired protein; there isn't an infinite supply of suitable adenovirus strains. The Sputnik V vaccine actually uses a different adenovirus for the first and second shots for this reason.
    - selimthegrim 6y ago
      I think this was only a problem with the HIV adenovirus vaccines.
- joshuamorton 6y ago
  That's not at all an obvious explanation. There obvious explanation is that different diseases have different levels of infectiousness. It just so happens that the symptoms the flu causes make it less virulent than covid-19.
- 6y ago
moftz 6y ago
I remember it not being a huge deal to have a bunch of people at work come with flu-like symptoms. "It's just something going around." Work gave out flu shots every year but that isn't 100%. It wasn't even considered much of a faux pas to show up to work feeling a little ill. Now, showing up to work with flu-like symptoms could put you in the hot seat with HR. Having a bunch of people fall ill in the office now results in it being closed for the day for cleaning. It won't stay this way forever but it's going to be a while until most people go back to being lax on contagious diseases. Imagine companies forcing employees and schools forcing students to mask up during flu season.
- ggggtez 6y ago
  One time I was really sick at an airport McDonalds. Fever, sneezing, the whole thing. But you're in an airport, and you have to eat something. I had to explain almost pedantically why they should allow me to order verbally instead of using their touchscreens, for the safety of the other customers. I think today, they'd have a protocol to accommodate people who are obviously sick so they don't have to touch anything. In fact, they probably don't even let healthy people use touch screens, if I had to guess.
  - hombre_fatal 6y ago
    You didn’t think of just washing your hands and maybe using a knuckle to touch the screen instead of going HN pedant on the $7/hr worker? Besides, I would think shooting mucus debris in their direction by talking is worse than using a cleaned knuckle on a screen far away from them.
    - ggggtez 6y ago
      So, in your expert medical opinion, given years after the fact without any understanding of the illness in question... You think that your advice that "you should just have washed your hands" is such amazing advice that you think it's worth writing here? What are you hoping to gain? And even if you were right, as I said, I had a high fever. It's not like I was thinking clearly. Are you trying to feel morally superior to someone who was in gravely ill?
epmaybe 6y ago
I'm really hoping that the culture change in the US is to wear masks in public when feeling ill from a respiratory infection.
- txsoftwaredev 6y ago
  Better yet just stay home.
- mindslight 6y ago
  I'm really hoping that the culture change in the US is to wear masks in public to thwart facial recognition.
- heavyset_go 6y ago
  Not wearing masks is a hill many people have chosen to literally die on, so while I hope that there is a culture change, I expect that anyone wearing masks after the pandemic is over will be demonized.
peder 6y ago
But the flu has always been here, even when our country was significantly less populated, when we were significantly more rural, and when people were significantly less connected in many ways. Like, how did we get flu pandemics in the 1700s? Weren't we less connected back then, even after you account for all the social distancing that was done this year?
- heavyset_go 6y ago
  > Like, how did we get flu pandemics in the 1700s? Germ theory of disease didn't exist back then.
- mountainboy 6y ago
  The flu (influenza) has been linked to solar radiation and electricity. -- quote -- In 2001, Canadian astronomer Ken Tapping showed that the influenza pandemics over the previous three centuries correlated with peaks in solar magnetic activity, on an 11- year cycle. It has also been found that some outbreaks of influenza spread over enormous areas in just a few days – a fact that is difficult to explain by contagion from one person to another. Also, numerous experiments seeking to prove direct contagion through close contact, droplets of mucus or other processes have proved fruitless. From 1933 to the present day, virologists have been unable to present any experimental study proving that influenza spreads through normal contact between people. All attempts to do so have met with failure. -- end quote -- source: https://www.5gexposed.com/wp-content/uploads/2019/04/English-Summary-of-The-Invisible-Rainbow-A-History-of-Electricity-and-Life-3.pdf https://www.5gexposed.com/wp-content/uploads/2019/04/English...
  - somebodythere 6y ago
    5gexposed.com is not really a reputable source. Anyway, > Also, numerous experiments seeking to prove direct contagion through close contact, droplets of mucus or other processes have proved fruitless. > From 1933 to the present day, virologists have been unable to present any experimental study proving that influenza spreads through normal contact between people. All attempts to do so have met with failure. This is just demonstrably false. https://www.ncbi.nlm.nih.gov/pmc/articles/PMC3682679/ https://www.ncbi.nlm.nih.gov/pmc/articles/PMC3682679/

jcims 6y ago

>Why did the flu also disappear in the states that had effectively no covid restrictions? Where are you getting this take? Life in the US in 2020 is dramatically different than it was in 2019.

kgin 6y ago

Large indoor gatherings, indoor restaurants, bars, were shut down for months. Grocery stores enforced or at least encouraged their own mask policies. What’s more in Florida, those few steps covered almost all the ways people really interact there. Like much of the US, there is almost zero spontaneous sharing of space outside of bars, restaurants, stores and churches. I personally dislike the isolation of extreme car culture, but it does help in situations like this.

shakezula 6y ago
I never really thought about how America's aversion to public transit could be a positive in a pandemic. Interesting point.

deleted 6y ago

[deleted]

ska 6y ago

> states that had effectively no covid restrictions? This isn't really true anywhere, some places had fewer state mandated restrictions, but effectively everywhere had significant changes in terms of breadth and depth of person-to-person contacts.

ericb 6y ago

I was in Florida two weeks ago--Orlando and Sarasota. I'm a Massachusetts resident. In Florida, I observed around 90+% mask usage in grocery stores. In a random ColdStone creamery, I saw maybe 70%, Five guys was probably 80% except while eating. In Massachusetts, usage is certainly higher, but maybe in practicality, not enough to make a difference compared to other factors?

Kiro 6y ago
1% mask usage in Sweden and we also have extremely low flu numbers.
- ericb 6y ago
  Interesting. Do people still associate indoors in large numbers, or is that unchanged as well? As in, could behavioral change be a driver? I also wonder, with far less numerical opportunity to spread and mutate, if the flu wasn't able to "grow" a good candidate with good evolutionary fitness this year, so distancing and mask usage affect countries even where they aren't practiced.
  - Kiro 6y ago
    No, we have other restrictions and recommendations resulting in various degrees of social distancing. Definitely less than countries that did lockdowns but it's probably as you say a combination of our own measures and other countries' more rigid restrictions (including masks) killing off the international transmission routes. So we should be thankful that other countries took this more seriously if that's the case.

jsight 6y ago

You seem to be implying that Florida had no restrictions, but this just isn't the case. Even when I went a couple of months ago, masking indoors was the norm and most places still had capacity restrictions. Queues at popular sites were socially distanced outdoors as well.

CorrectHorseBat 6y ago

Apart from what others said. Flu is seasonal and (most of the time?) starts in Asia. With very restricted international travel flu simply has less possibilities to come over.

Jabbles 6y ago

Flu disappeared globally. With no incoming cases, it would have had to spread simply by internal transmission, which by definition would be less than usual. Also, there were probably minor restrictions people took upon themselves, like staying home when they had flu-like symptoms, or shunning people that coughed.

tedunangst 6y ago

Short answer is that photos of people on the beach are an incomplete representation of the situation in Florida.

DanBC 6y ago

Flu is seasonal, and there are large pushes to get people vaccinated against flu each year. Sometimes those vaccinations are more effective, and sometimes you get more people vaccinated. This season it appears both are true.

failwhaleshark 6y ago
It's only seasonal because of increased indoor/outdoor humidity permitting longer micro-droplet aerosol suspension. If everyone were wearing masks that trap micro-droplets, then flus and colds effectively die out. It's the no maskers and chin-guarders that cause infectious agents like SARS-CoV-2, flu, and colds to proliferate.

jMyles 6y ago

The notion that horizontal interdiction is responsible for this suppression is absolutely, positively absurd and will never stand up to scrutiny. On the other hand, this patterns very neatly with previously observed and well-documented phenomena of viral interference, specifically with respect to influenza. Here's a good paper to start a journey of research on this topic: https://academic.oup.com/jid/article/212/11/1690/2911897 https://academic.oup.com/jid/article/212/11/1690/2911897

hvac 6y ago
Norovirus was also decimated last year, and it doesn't infect the same organs/cells as respiratory viruses: https://www.cdc.gov/norovirus/reporting/norostat/data.html https://www.cdc.gov/norovirus/reporting/norostat/data.html
- jMyles 6y ago
  Sure. I think it's plausible that widespread surface sterilization is responsible for suppression of fomite transmission.

caturopath 6y ago

1. All places had COVID responses, even places that didn't have state-wide rules. I doubt that there were any real number of Americans -- even in isolated communities -- whose lives were not impacted by public health stuff during COVID. 2. Having flu outside your border be rarer means less flu coming in.

cm2012 6y ago

It's pretty huge that people with cold/flu symptoms now stay home or mask up. People used to just cough and sneeze everywhere.

pmontra 6y ago

A single data point: I didn't get flu once since I went self employed and started working from home most of the time in 2006. Less public transport, less open space offices, less restaurants at lunch time. Maybe a coincidence but if people had less chances to meet other people, maybe because those other people kept social distancing, then they had less chances to get flu. It's way less contagious than covid to start with.

rsynnott 6y ago

Behavioral change. Flu is generally less infectious than covid, so it will take less voluntary behavioral change to get the flu R-number below 1 than the covid one. Also, the whole hand-sanitiser-everywhere thing, while in retrospect probably not super effective against covid, would be expected to be quite effective for the flu.

lkbm 6y ago

There are a bunch of contributing factors (most schools, indoor public places, and workplaces encouraging or requiring masks, and many workplaces remote), but one thing that I'd expect to help with flu much more than it does with COVID-19 is sick people staying home. Asymptomatic spread is a much larger risk with COVID-19 compared to the flu. A simple behavior change of "If I feel sick, I don't go to work/school/grocery shopping" isn't enough to stop COVID, but could cut flu spread a ton by itself.