evidence: If you’re thinking about donating your blood but you just got the COVID-19 vaccine or are planning to get it soon, there are few things you need to keep in mind before you give. [...] But to be eligible, you’ll need to know and be able to give the name of your COVID-19 vaccine’s manufacturer. Approved manufacturers include Johnson & Johnson, Moderna, Novavax, and Pfizer. You can donate as long as you don't have symptoms of COVID-19 and feel well when you’re about to donate. [...] But if you’ve had the COVID-19 vaccine, the FDA allows you to give convalescent plasma only within 6 months of your initial COVID-19 infection. To be eligible, you need to have sufficient antibodies from the virus, not the vaccine. This is because the antibodies you develop from the viral infection are different from those you develop after you’ve had the vaccine.