A T cell discovery, “hachimoji” DNA, a new species of human, and mounting fears of espionage rounded off the list this year.

The public health emergency has spurred a mass vaccination campaign.

Two studies present biological evidence that measles infections in unvaccinated children wipe out immune memories of other pathogens, putting the kids at risk of other deadly diseases.

The number of measles cases this year is already more than all of the cases reported in 2018.

Mathematical models reveal that current vaccination rates in Texas schools could pave the way for the virus to spread to hundreds of people.

The forecast for upcoming outbreaks failed to foresee the cluster of infections currently affecting Brooklyn.

Health officials have asked students and staff potentially exposed to the virus and who either have not been vaccinated or cannot verify immunity to stay home.

There are now more cases of measles in America than in any year since the disease was eradicated nearly 20 years ago.

So far this year, 465 infections have been reported, with numbers approaching their highest since measles returned to the country.