Researchers claim the immunity should last "a few months" in the absence of new stimulation of the immune system. Immunity also applies to only some aspects of the virus, mutations can make it less useful. Julien. -----Original Message----- From: ietf <ietf-bounces@xxxxxxxx> On Behalf Of Rich Kulawiec Sent: Wednesday, March 25, 2020 1:49 PM To: ietf@xxxxxxxx Subject: Re: IETF in July On Fri, Mar 20, 2020 at 04:46:55PM -0400, Keith Moore wrote: > Don't stop at July 2020.?? Plan contingencies through at least EOY 2021.??? > Until there's global herd immunity of one kind or another, continued > restrictions on travel seem likely. Note that -- at the moment -- while it seems likely that those who have been infected with COVID-19 and survived it will develop some immunity to it, I'm unaware of any research that indicates *how long* such immunity might persist. So while long-term global herd immunity is indeed a possibility, it would probably be best to avoid assuming it will exist until there is ample evidence that it does exist. ---rsk
