CHICAGO, Oct 1 (Reuters) - U.S. health officials are hoping data on Israeli military personnel can help clarify the risk of heart muscle inflammation in younger people who have received Pfizer/BioNTech COVID-19 booster shots - a potential factor for U.S. regulators as they consider granting full approval of these boosters.

A condition called myocarditis has in rare cases been linked to the two-dose mRNA vaccines made by Pfizer(PFE.N)/BioNTech (22UAy.DE) and Moderna (MRNA.O), mostly in younger males, but U.S. health officials are trying to better understand the risk.