[T]here are many unknowns in how the SARS-CoV-2 virus interacts with the human immune system and how this might play into current scenarios. For example, we don

[T]here are many unknowns in how the SARS-CoV-2 virus interacts with the human immune system and how this might play into current scenarios. For example, we don’t yet know if this novel virus will induce long-term immunity in those affected as other related viruses do not. That was really interesting to me. I didn't know infection with related viruses doesn't confer long-term immunity. Anybody know more precisely how closely related? All of Coronaviridae?