Doctors Warn This Winter’s Flu Season Could Be Especially Bad

The U.S. may be in for a sick winter.

Based on record-high influenza numbers in Australia, where flu season just wrapped up, U.S. health officials are bracing for a similar situation, according to a perspective piece published in the New England Journal of Medicine on Wednesday.

To make matters worse, the Australian flu vaccine—which has the same composition as the U.S. vaccine—was only effective in roughly 10% of cases, the article says.