To measure how well a vaccine works in a clinical trial, the Food and Drug Administration (FDA) first looks at the number of people who fell ill with the disease.
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…
The right to require Covid-19 vaccination in places of business, entertainment, and education ultimately depends on state or local law. So be sure to check requirements specific to your area.
Although rare, some people have reported allergic reactions to the vaccines. An extraordinarily tiny fraction of vaccine recipients have experienced anaphylaxis -- a severe allergic reaction that can impair people's breathing.
The Centers for Disease Control and Prevention (CDC) recommends waiting 14 days after receiving another vaccine to get the Covid-19 vaccine. Similarly, the CDC recommends waiting 14 days after receiving the Covid-19 vaccine to get another vaccine.
People with certain underlying or pre-existing conditions, including cancer, diabetes, kidney disease, obesity, and heart disease, are more likely to experience severe complications from Covid-19 -- so they're strongly encouraged to get the vaccine.
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…
The authorized vaccines do not contain the Covid-19 virus, and you cannot develop Covid-19 from the vaccines. Therefore, the vaccines cannot make you contagious with Covid-19 to anyone you come into contact with.
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. 
Reports of life-threatening reactions resulting from the side effects of Pfizer-BioNTech, Moderna, and Johnson & Johnson vaccines are extremely rare. Still, it's important to address any concerns people may have.