No, the Covid-19 vaccines will not alter your DNA. Both vaccines currently used in the United States rely on messenger RNA, or mRNA.

There isn't much data yet regarding the Covid-19 vaccines' impact on pregnant women. According to the Centers for Disease Control and Prevention, "experts believe that mRNA vaccines are unlikely to pose a risk to the pregnant person or the fetus because mRNA vaccines are not live vaccines."

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.

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.

There will be enough vaccines for everyone, but it will take some time. There are limited vaccine doses available right now, but the federal government is actively working with vaccine manufacturers to increase production. As other vaccines are authorized, even more doses will be available to the…

The federal government is delivering vaccine shipments in bulk to states, which are then responsible for distributing the doses to different vaccination sites, such as pharmacies and clinics. Therefore, the vaccine is available in different places in different states.

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.

Based on clinical trial data, experts say it's unlikely that any of the vaccines currently authorized by the FDA will interact with other medications.

Viruses change all the time. That's because they copy themselves to reproduce. Think of our cells as having their own xerox machines, which the virus takes over for its own purposes.