@JeromeAdamsMD Because you'd still need it if smallpox showed up and that would be more of an emergency?
@JeromeAdamsMD，因为如果出现天花，你仍然需要它，而这更像是紧急情况？
@JeromeAdamsMD Because you'd still need it if smallpox showed up and that would be more of an emergency?
@JeromeAdamsMD，因为如果出现天花，你仍然需要它，而这更像是紧急情况？