@seguin_mitch @dj1au @EricTopol @picardonhealth It is good for a year because flu stops circulating for all practical purposes for the rest of the year after several months. So you have all the protection you need for the year.
@seguin_mitch @dj1au @EricTopol @picardonhealth 一年好，因为流感在几个月后的余下时间里停止传播。因此，您拥有全年所需的所有保护。