3 ms·
These are great points, thanks for helping me learn something!
by claytongulick 4y ago
These are great points, thanks for helping me learn something!
- gus_massa 4y agoAlso, polio has waves. 95% of the persons that get the virus doesn't get paralysis, so in a big outbreak most people get infected but only a small part get paralysis. If there are no infections going on for a long time, there are many people that can be infected and if there are some initial cases you can get a wave. After the wave almost everyone got infected and will not be infected again so any outbreak dies. But after some years there are too many young people that can be infected and you get another big wave. Total cases in USA: https://ourworldindata.org/grapher/reported-paralytic-polio-cases-and-deaths-in-the-united-states-since-1910 https://ourworldindata.org/grapher/reported-paralytic-polio-... Note that the peak is near 60.000 per year Recent worldwide cases https://en.wikipedia.org/wiki/Polio#/media/File:Number_of_wild_polio_and_cVDPV_cases_since_2000.png https://en.wikipedia.org/wiki/Polio#/media/File:Number_of_wi... Note that the peak for the wild type is near 2000 and the vaccine derived type is near 1000.