How the Covid pandemic ends: Scientists look to the past to see the future

We’re approaching the year-and-a-half mark of the globe’s collective experience with the SARS-CoV-2 virus and the Covid-19 pandemic it has triggered. At this point, it’s fair to assume people the world over are asking themselves the same two questions: How will this end? And when? There may have been a fleeting chance humans could have halted spread of SARS-2 and driven it back into nature, as happened with its cousin, SARS-1. But that door was firmly shut long ago. It also seems that another option — vaccinating our way out of the pandemic — is an expensive toll highway that few countries will be able to access in the near term.