Thankfully most people I see do seem to be trying to keep a 6-foot radius between households, even in the pictures of crowded beaches that make it to the news.

Thankfully most people I see do seem to be trying to keep a 6-foot radius between households, even in the pictures of crowded beaches that make it to the news. Is there any evidence that brief incidental contact can spread the virus in significant amounts? I seem to recall that at one point officials were saying you needed extended (15 minutes or more) close contact to be considered at risk. If that is the case then I don’t see much risk in walking past another person on your way to the beach. And if it’s not the case then we might as well give up on contact tracing, because without massive invasions of privacy we can’t trace down every passerby of an infected individual. Of course the science has been moving fast here, so this could be outdated.