"What we know (and don't) about Covid-19's effect on the immune system." 4. Covid-19 vaccine 5. 172% increased risk 6. Other illnesses 7. 49% of Covid infections are asymptomatic https://mediacdn.aus.social/media_attachments/files/116/712/056/725/331/481/original/ab7114af50344e21.png https://media...