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According to Table 2 their sample had 8,199 unvaccinated and 9,269 vaccinated. It seems odd that more cases were found in the vaccinated people, can anyone sug

According to Table 2 their sample had 8,199 unvaccinated and 9,269 vaccinated. It seems odd that more cases were found in the vaccinated people, can anyone suggest why? Statistical anomaly? Edit: I misread the table, I thought column 1 was number of subjects. The replies explain well why the # of cases would be larger for the (larger) vaccinated population.

deleted 5y ago
[deleted]
sdenton4 5y ago
Consider the extremal point: If 100% of people are vaccinated, then all cases are breakthrough cases, and 0% of cases will be in unvaccinated people. At some point, the raw count of breakthrough cases crosses over and exceeds the raw count of unvaccinated cases. This doesn't mean the vaccine is ineffective, of course!
- GameOfFrowns 5y ago
  - Xylakant 5y ago
    No, that’s not what it means. It means that comparing the absolute numbers of people infected in both groups - vaccinated people and unvaccinated people - or even the percentage of the total number of infections is not valid. You need to take the ratio of people infected relative to the group size.
  - shawabawa3 5y ago
    What? If you think for 5 seconds it's extremely easy to see how effective the vaccine is Compare the % of population that is vaxxed Vs unvaxxed, compare the % of cases in vaxxed Vs unvaxxed people, see how the percentage compares
akrito 5y ago
It's because many more people are vaccinated. Assume 100,000 people are vaccinated and 10,000 aren't. If the infection rate in vaccinated population is 5%, and in the unvaccinated population is 50%, then out of 10,000 infected people, 5,000 will be vaccinated and 5,000 won't.
- landemva 5y ago
  A couple years ago vaccines prevented almost all people from getting sick. Not anymore.
  - ramesh31 5y ago
    You need 90%+ vaccination rates to start seeing herd immunity, which is what we have for things like MMR.
    - landemva 5y ago
      Does a prior infected person count toward herd immunity? I have Dr. letter of my recovery. I heard those who had it and recovered have sterilizing immunity. Is that better or worse than the vaccine non-sterilizing immunity for getting us to herd immunity?
      - rabuse 5y ago
        Anecdotal, but I got my first bought of covid in Feb. 2020, and it was very flu-like for me. I've had 2 more infections after that (one, didn't even know, and the next was like a mild cold). In South Florida, we barely had a lockdown.
        beberlei 5y ago
        How do you even know it was COVID? It could have been any number of flu/cold? In feb 20 there was no way to get tested for it
        5y ago

deleted 5y ago

[deleted]

sdenton4 5y ago

Consider the extremal point: If 100% of people are vaccinated, then all cases are breakthrough cases, and 0% of cases will be in unvaccinated people. At some point, the raw count of breakthrough cases crosses over and exceeds the raw count of unvaccinated cases. This doesn't mean the vaccine is ineffective, of course!

GameOfFrowns 5y ago
- Xylakant 5y ago
  No, that’s not what it means. It means that comparing the absolute numbers of people infected in both groups - vaccinated people and unvaccinated people - or even the percentage of the total number of infections is not valid. You need to take the ratio of people infected relative to the group size.
- shawabawa3 5y ago
  What? If you think for 5 seconds it's extremely easy to see how effective the vaccine is Compare the % of population that is vaxxed Vs unvaxxed, compare the % of cases in vaxxed Vs unvaxxed people, see how the percentage compares

akrito 5y ago

It's because many more people are vaccinated. Assume 100,000 people are vaccinated and 10,000 aren't. If the infection rate in vaccinated population is 5%, and in the unvaccinated population is 50%, then out of 10,000 infected people, 5,000 will be vaccinated and 5,000 won't.

landemva 5y ago
A couple years ago vaccines prevented almost all people from getting sick. Not anymore.
- ramesh31 5y ago
  You need 90%+ vaccination rates to start seeing herd immunity, which is what we have for things like MMR.
  - landemva 5y ago
    Does a prior infected person count toward herd immunity? I have Dr. letter of my recovery. I heard those who had it and recovered have sterilizing immunity. Is that better or worse than the vaccine non-sterilizing immunity for getting us to herd immunity?
    - rabuse 5y ago
      Anecdotal, but I got my first bought of covid in Feb. 2020, and it was very flu-like for me. I've had 2 more infections after that (one, didn't even know, and the next was like a mild cold). In South Florida, we barely had a lockdown.
      - beberlei 5y ago
        How do you even know it was COVID? It could have been any number of flu/cold? In feb 20 there was no way to get tested for it
        5y ago