AstraZeneca, Pfizer, Moderna, J&J: Differences between COVID-19 vaccines efficacy and side effects – KGO-TV
SAN FRANCISCO -- Another COVID-19 vaccine -- AstraZeneca -- is poised to arrive in the U.S., bringing a fourth option for Americans. Each vaccine is administered slightly differently, some can result in different side effects, and studies have shown varying efficacy. We're breaking down the key differences between the COVID-19 vaccines available, plus the likely-to-be approved AstraZeneca.
What are the options?
The Pfizer, Moderna and Johnson & Johnson vaccines have already been authorized for emergency use by the FDA. AstraZeneca is expected to apply for emergency use authorization in the next few weeks.
Which vaccines require one dose and which require two doses?
Johnson & Johnson is the only one-shot vaccine. The others all require two doses at different time intervals. Pfizer...