Just half of respondents in Eastern Europe agree that vaccines are safe.

Science doesn’t require faith, but fostering trust in its practitioners can help the public move past unfounded doubts.

Lymph from cattle proved more effective at inducing immunity to smallpox than the older, person-to-person method.

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.

The World Health Organization and its partners will test the public health effect of immunization in parts of Malawi, Ghana, and Kenya.

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

Most people who contracted the disease were unvaccinated and some state legislatures are now considering whether to curtail nonmedical vaccine exemptions.

After attacks on two Ebola treatment centers in Democratic Republic of Congo last week, Doctors Without Borders says public health workers are “failing” to control the epidemic.