Vaccinated individuals 50 years or older — and those as young as 12 who are significantly immunocompromised — can now get a second COVID-19 booster shot, thanks to federal government decisions Tuesday designed to increase protection among those at higher risk of infection. But experts appeared split on the need to allow for a second booster, or fourth shot of the mRNA vaccines made by Pfizer and Moderna. Some saw little downside and welcomed the potential additional protection in the announcement that has been rumored for weeks. “I think the benefit outweighs the risk,” said Rutgers School of Public Health Dean Perry Halkitis. To read the full story.