More than 74,000 adults over age 50 sought titer tests since last year, exclusive data shows.

Internal records show how the South Carolina outbreak started with just four households, then spread through networks of unvaccinated people.

Also in New York public health news: the importance of closing doors for fire safety, and what to know about peptides being sold at medspas.

7 things to know about how the largest U.S. outbreak in 35 years started and ended.

One of the clearest warning signs is measles, mumps, rubella coverage, which has dropped. New York state has confirmed eight measles cases this year.

While South Carolina’s outbreak may be ending, cases are rising elsewhere — including a fast-growing outbreak in Utah.

Outbreak near Detroit is one of 17 new U.S. measles outbreaks. Some are large, many are small.

This week, the CDC began to publish long-awaited data that will reveal the extent of measles’ comeback. While applauding the science, researchers say the Trump administration has done little to contain the virus. 'That we’re even talking about this is nuts,' one said.

CDC modelers warn some infections may be going unreported, raising concerns about continued spread.

Popular destination Florida is No. 3 for measles. Cases have been reported in 30 states. 'Everybody’s on high alert,' said Pat Endsley, president-elect of the National Association of School Nurses.

Subacute sclerosing panencephalitis, or SSPE, typically takes years to rear its head. 'We don’t have a way of knowing who’s going to get it, and we don’t have a way of very effectively treating it,' one expert said.

Healthbeat revealed last month that the South Carolina Department of Public Health was hamstrung over the winter holiday break in its efforts to quickly warn and quarantine students and staff who had been exposed.

State health investigators determined that the Bryan County patient exposed 'several dozen' other people in Georgia to the virus.

Outbreak centered in Spartanburg County reaches 990 cases. Spring break travel worries state officials.

Long hours from front-line epidemiologists and a recent increase in vaccinations is credited for declining measles cases. But state official warns: 'It’s not nearly over yet.' And spring break is on the way.

As U.S. hospitals face an increasing risk of encountering measles, and pressure to immediately spot it, health care workers face an unusual barrier: Many don’t know what it looks like.

With schools closed for winter break, health officials couldn’t get critical information to identify and warn those exposed to measles of need to quarantine.

Prisma Health’s announcement came two days after Healthbeat revealed measles exposures in the labor and delivery unit at Prisma Health Greer Memorial Hospital and in the emergency department of Prisma Health Greenville Memorial Hospital. 

Healthbeat exclusive: ‘Highly concerning’ measles exposure at hospital maternity unit plus exposures at BMW plant and Kentucky youth conference are among new details.