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How do researchers determine vaccine efficacy?
To measure vaccine efficacy, or how well a vaccine works in a controlled clinical trial, the Food and Drug Administration (FDA) first looks at the number of people who fell ill with the disease. Then the agency compares whether they received the vaccine or the placebo (a…
The current Covid-19 vaccines are supposed to be administered twice. Do I really need both doses?
Yes. According to existing clinical trial data, authorized Covid-19 vaccines are shown to be safe and effective at preventing Covid-19 when recipients receive the two specified doses of each vaccine based on the timing used in the trials.
Why is diversity in vaccine clinical trials important?
The answer is to meet the needs of every family and community. All individuals – regardless of age, gender, ethnicity, or health status – should have a safe and effective vaccine available to them.
How is a booster shot different from the regular shot?
The FDA has authorized booster shots of the Pfizer-BioNTech, Moderna, and Johnson & Johnson vaccines for tens of millions of people who've already completed their primary vaccination series. Nothing has changed in the chemical formulas of each booster, compared to their regular shot. The side…
Has the FDA approved any Covid-19 vaccines?
The Food and Drug Administration (FDA) has granted Emergency Use Authorization (EUA) to the Pfizer-BioNTech vaccine, the Moderna vaccine, and the Johnson & Johnson vaccine. Additional vaccines are in Phase 3 of clinical trials and maybe submitting data for review with the FDA soon.