Herd immunity is the name for a point in time when it's hard for a disease to spread through a group of people. The idea of herd immunity works for some diseases, such as measles. But it's a harder ...

Colorado measles vaccination rates are falling behind other states, leading to a lower herd immunity among children.

Colorado measles vaccination rates are falling behind other states, leading to a lower herd immunity among children. A recent data analysis by The Washington Post found that Colorado has an 88% herd ...

A ferocious surge of flu cases is linked in part to a variant that has not been dominant in the past few years — resulting in ...

The immune system’s first encounter with a virus or vaccine establishes a “starting template” that shapes its response to new ...

A state Supreme Court has revived a four-year-old lawsuit alleging a nursing home was negligent in a patient’s death at the the height of COVID-19 — even though the state had adopted a wide immunity ...

Flu cases and hospitalizations are surging, already breaking last season's records. Here's where activity is highest, what ...

'Tis the season of vigorous handwashing and using copious amounts of hand sanitizer as Americans try to avoid getting sick before the holidays. Health agencies like the Centers for Disease Control and ...

SAN FRANCISCO -- Preliminary data out of South Africa is giving the world insight into how strong omicron really is. The South African Medical Research Council just reported this variant may cause ...

Subclade K, which is circulating in Arizona, has been dubbed a 'super flu' but some experts say that's not an accurate characterization.