How much protection does the first vaccine dose give?

Consider a recent study carried out by the Centers for Disease Control and Prevention (CDC) of the authorized vaccines. Pfizer-BioNTech and Moderna's vaccines were found to be 82 percent effective after one dose in preventing people from getting Covid-19 cases with symptoms.

The Pfizer-BioNTech Covid-19 vaccine demonstrated 52 percent efficacy in protecting against disease after the first dose, according to the clinical trial data. The Moderna vaccine demonstrated 80.2 percent efficacy after the first dose. To maximize the protection from these vaccines, it is important to get both doses.

 The Johnson & Johnson vaccine was 85 percent effective in preventing severe disease across all regions studied, and showed protection against COVID-19 related hospitalization and death, beginning 28 days after vaccination, according to existing data.

Learn more about vaccine efficacy here.

Read more about the clinical trials for the FDA-authorizedPfizer-BioNTech, Johnson & Johnson, and Moderna vaccines.  

What are the side effects of Covid-19 vaccines?
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The FDA and CDC have authorized Pfizer-BioNTech's vaccine for use in children ages 5 through 11 based on strong safety and effectiveness data. The vaccine's safety was studied in roughly 3,100 children who received the vaccine and no serious side effects have been noted. The Pfizer-BioNTech vaccine was also found to be 90.7% effective in preventing Covid-19 infections in this age group. The immune responses were in line with what has been shown in people ages 16 through 25. Vaccinations…
Can I mix Covid vaccines and/or booster shots?
The FDA has authorized mixing booster doses of the Pfizer-BioNTech, Moderna, and Johnson & Johnson vaccines. Following the completion of primary (two shots for Pfizer and Moderna and one shot for J&J) vaccination, eligible individuals may choose to use the same or a different available Covid-19 vaccine as their booster dose.
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The FDA has authorized booster shots for tens of millions of people who previously received two Pfizer-BioNTech or Moderna doses, including: Seniors ages 65 and older Adults ages 18+ who have underlying medical conditions that put them at increased risk of the virus Adults ages 18+ in long-term care facilities, such as nursing homes or assisted living People at increased risk of the virus due to their working or living situations -- including first responders, teachers and school…
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