Extended interview: Expert explains how COVID-19 vaccines work and side effects after shots Dr. Williams Moss, an epidemiologist and executive director of the International Vaccine Access Center at Johns Hopkins, explains how mRNA vaccines by Pfizer and Moderna work and why side effects are more likely after the 2nd dose. Facebook announced Monday it would be launching the “largest worldwide campaign” to combat misinformation surrounding the coronavirus and COVID-19 vaccines. The social media giant said it also aims to provide helpful information for its more than 2 billion users about vaccine eligibility, safety and relevant health updates. As the drive to get the American public vaccinated gathers steam, Facebook said it aims to help people better understand the guidelines for vaccine rollouts.More than 4 million more vaccinations were reported over the weekend, a significantly faster clip than in previous days, according to the U.S. Centers for Disease Control and Prevention. Nearly 1 in 10 Americans have now received at least one shot. But just 2.9% of the U.S. population have received their second dose, a long way from the 70% or more that experts say must be attained to reach herd immunity.Facebook said that its initiative to provide vaccine information…
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