Patient safety is central to the research and development of a vaccine. Like all new medicines or treatments, vaccines must pass a rigorous set of tests before being approved by independent, scientific experts at the U.S. Food and Drug Administration. 
The Delta variant is the most contagious variant of COVID-19 to date, fueling new outbreaks in the United States and worldwide. This variant spreads twice as fast as other variants (read more about how viruses mutate here). Unvaccinated people are especially at risk of contracting Delta…
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…
By readying the immune system for future health battles, vaccines protect individuals around the world from dangerous diseases. 
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. 
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."
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…
Researchers are moving fast to develop vaccines to combat Covid-19. In the past, it would take years to bring a new vaccine through all the regulatory hurdles established by the Food and Drug Administration (FDA) and to approval.
According to the Centers for Disease Control and Prevention (CDC), it can take a few weeks for your body to build up antibodies and maximize Covid-19 protection after receiving the second dose of the vaccine. That's why wearing masks, social distancing, practicing hand hygiene…
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…