Second Booster Combos Tested by NIH as Future Variants Loom

The threat of future variants has prompted a study into second booster dose combinations in a bid to determine how best to protect against strains that could evade currently available vaccines.

A clinical trial funded by the National Institute of Allergy and Infectious Diseases, announced Thursday, began testing six combinations, including experimental boosters that target different variants of the Covid-19 virus. Researchers are looking at what happens if a volunteer receives a dose that targets, for example, both the delta and omicron variants.

“We are looking beyond the Omicron variant to determine the best strategy to protect against future variants,” ...