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Health authorities are trying to determine whether heart inflammation that can occur along with many types of infections could also be a rare side effect in teens and young adults after the second dose of COVID-19 vaccine.

An article on seven U.S. teen boys in several states is among the latest reports of heart inflammation discovered after Covid-19 vaccination.

More Study Urged After 7 Teen Boys Suffer Heart Inflammation After Getting COVID-19 Vaccine On 6/4/21 at 1:20 PM EDT Several teenage boys who experienced non-life-threatening heart inflammation after receiving the second dose of the COVID-19 vaccine have prompted health officials to look into whether the cases could be a rare vaccine side effect in teens and young adults. According to an article published online Friday in Pediatrics, seven teenage boys in the U.S. experienced heart inflammation...

The boys received Pfizer shots in April or May and developed chest pain within a few days. Authorities say vaccination benefits far outweigh any potential risk.

Drug companies work to improve COVID-19 vaccines to fight variants of the coronavirus and other viruses and make them easier to distribute.

USA TODAY To prove their COVID-19 vaccines worked, companies had to enroll more than 100,000 participants in monthslong clinical trials. Next time, Peter Gilbert wants such tests to require only a few hundred people and eight weeks time. To get there, Gilbert and others have to figure out how much protection people need to avoid hospitalization and death from COVID-19, or even to prevent getting infected at all. But 15 months after COVID-19 shut down most of the world, its still not clear what ...

. (Tribune News Service) — To prove their COVID-19 vaccines worked, companies had to enroll more than 100,000 participants in monthslong clinical trials. Next time, Peter Gilbert wants such tests to require only a few hundred people and eight weeks time. To get there, Gilbert and others have to figure out how much protection people need to avoid hospitalization and death from COVID-19, or even to prevent getting infected at all. But 15 months after COVID-19 shut down most of the world, its...

What level of antibodies protect against COVID-19? Researchers are rushing to find out Elizabeth Weise, USA TODAY Replay Video UP NEXT To prove their COVID-19 vaccines worked, companies had to enroll more than 100,000 participants in monthslong clinical trials. Next time, Peter Gilbert wants such tests to require only a few hundred people and eight weeks time. To get there, Gilbert and others have to figure out how much protection people need to avoid hospitalization and death ...

AstraZeneca: FDA wants more data on vaccine Erika Edwards © Provided by NBC News The Food and Drug Administration has asked AstraZeneca for a large amount of extra data related to its Covid-19 vaccine, further delaying the companys application for an emergency use authorization, or EUA, in the United States, according to a letter from the company obtained by NBC News. AstraZeneca sent the letter, dated April 21, to U.S. clinical trial investigators. It reads, in part, "This is...

The Atlantic The mRNA Vaccines Are Looking Better and Better Concerns about blood clots with Johnson & Johnson underscore just how lucky Americans are to have the Pfizer and Moderna shots. Katie Martin / The Atlantic A year ago, when the United States decided to go big on vaccines, it bet on nearly every horse, investing in a spectrum of technologies. The safest bets, in a way, repurposed the technology behind existing vaccines, such as protein-based ones for tetanus or hepatitis B. The medium ...