Forget the candy this Halloween. Get your kids vaccinated. That’s the underlying message of some recent news regarding communicable—and vaccine-preventable—diseases, just in time for trick or treating. For starters, there’s an ongoing rubella outbreak in Japan to worry about, and some concerning new data on influenza from the US Centers for Disease Control and Prevention (CDC). First, rubella: Reports suggest that more than 1100 cases of the disease have been confirmed in Japan, mostly in Tokyo, Kanagawa, Chiba, and Saitama prefecture. The CDC has issued a warning to Americans who plan to travel to the Asian nation, touting the MMR vaccine. The agency has also used the outbreak to remind women that rubella infection occurring during early pregnancy has been linked with miscarriages, stillbirths, and severe birth defects, including congenital rubella syndrome, in infants. There’s a need to do so, obviously, given the ongoing concerns regarding MMR vaccine uptake in the United State...