Risk of bipolar rises after exposure to maternal flu

The US study involved 92 cases of bipolar disorder among 214 participants and 722 controls drawn from a large birth cohort.

Offspring who were exposed in utero to the flu at any gestational stage were nearly four times more likely to develop bipolar disorder, and this was not changed after adjusting for maternal age and psychiatric history, the researchers found.

“Although replication is required, the findings suggest that prevention of maternal