A mother holds her daughter after they both received a flu vaccination shot at a local library on Oct. 14, 2020, in Lakewood, California. (Mario Tama/Getty Images) At a Glance It's often assumed older people are most likely to get the flu.Children under 5 and adults over 65 are more likely to suffer complications.Flu numbers this year remain extremely low. It's often assumed that older people are more likely to get sick from the flu. But in fact, children younger...

Computer-generated representation of Naegleria fowleri in its ameboid trophozoite stage, in its flagellated stage, and in its cyst stage. More commonly known as brain-eating amoeba, scientists say climate change may be pushing it farther north. (U.S. Centers for Disease Control and Prevention) At a Glance Researchers at the CDC looked at 85 cases of the rare brain infection caused by the amoeba.They found that cases in northern latitudes increased as temperatures got warmer.Only four people have ever survived the infection...

At a Glance Southern ticks tend to choose lizards, mostly skinks, as their hosts.Lizards don't transmit Lyme disease bacteria as efficiently as small mammals.A big drop-off in the number of cases of Lyme disease happens south of Virginia. Lyme disease affects in the U.S. and most of the cases turn up in the Northeast even though the black-legged ticks that spread it can be found across the entire country. Lizards may be the reason for that geographic discrepancy, new research...