The CDC has confirmed 48 West Nile cases by June 30, far above the usual 10, with Arizona hardest hit as officials urge simple precautions over the July 4 weekend.

The CDC has moved to its highest response level as the Congo-Uganda Ebola outbreak becomes the third largest on record. For US readers, the risk stays low.

For the first time, the American College of Obstetricians and Gynecologists released its own maternal immunization schedule on June 10, recommending four vaccines during pregnancy—including flu and COVID-19 shots that the CDC no longer endorses.