No, herd immunity is the reason polio, measles etc don't really exist in the first world any more. Herd immunity is absolutely a real thing, unless it starts mutating rapidly enough. One issue is that with the new strains the herd immunity threshold is higher but enough vaccines are produced that it won't be a big issue.
No, herd immunity is the reason polio, measles etc don't really exist in the first world any more. Herd immunity is absolutely a real thing, unless it starts mutating rapidly enough. One issue is that with the new strains the herd immunity threshold is higher but enough vaccines are produced that it won't be a big issue.