claim: herd immunity is still an answer to a pandemic
evidence_1: many researchers say pursuing herd immunity is a bad idea.", "and because variables can change, including r 0 and the number of people susceptible to a virus, herd immunity is not a steady state.", "attempting to reach herd immunity via targeted infections is simply ludicrous, andersen says.", "greta bauer: if that were the situation, then there's no potential to develop a level of herd immunity sufficient to stop the infection.")