What does #HerdImmunity mean in context with #SARSCoV2?
We don’t need the entire population to be vaccinated or the vaccines to be 100% effective (they never are); we just need them to reduce infection rates enough to get us <1. That is herd immunity 1/
wsj.com/articles/the-c…
We don’t need the entire population to be vaccinated or the vaccines to be 100% effective (they never are); we just need them to reduce infection rates enough to get us <1. That is herd immunity 1/
wsj.com/articles/the-c…
The issue is more complex. Despite achieving high seropositivity in certain regions, resurgences have occurred. And in certain regions/countries, the virus suddenly retracted even in the absence of a significant sero-positivity 2/
It is not a pure mathematics. There is an interplay of infection or vaccine-induced immunity & the evolution in the virus. The 'Ro' is not a fixed number--keep on changing with the virus transmissibility. With this changes the thresholds to achieve 3/
The only selective advantage for the virus is to acquire higher infectiousness to gain access to more hosts to survive. So, it is a race between the virus & the host. Currently, the virus is dictating the terms 4/
Despite going beyond any set threshold for 'herd protection', we have witnessed the virus has ripped that apart. The type of vaccines & their ability to resist transmission is another factor 5/
Making any prediction on the future course of the outbreak is fraught with high risks. Several epidemiologists/virologists have proven wrong with their forecasts last year. Let’s first accomplish the task at hand 6/end
timesofindia.indiatimes.com/city/chennai/h…
timesofindia.indiatimes.com/city/chennai/h…
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