this is to prevent you from getting hospitalized or dying, god forbid. a new study out of london found more than two-thirds of the participants who tested positive already had covid in the past. does that throw out the window what a lot of people thought, if i had coronavirus one, i m probably safe or at least safer than people haven t had it. yes, it is. but most of the people who ended up with reinfection didn t end up in the hospital in the surge in march/april 2020. everybody is becoming an at-home virologist. as a physician, we change the flu vaccine every year. sometimes you can get your flu shipment as a doctor in august and sometimes it doesn t arrive in october or november. they re working on basing the flu vaccine from the year before