Pennsylvania is bracing for a wave of measles cases, with some public health officials concerned that it is "only a matter of time" until the disease spreads beyond the outbreak's epicentre. Last week the state reported its fifth measles-associated death amid 943 confirmed cases across 39 counties.
The outbreak comes amid concerns that public health in the US has been hit by increasing vaccine skepticism, especially due to the influence of health secretary Robert F Kennedy Jr.
A key challenge is that Pennsylvania is one of the few US states where most counties lack their own health department, with only seven of its 67 counties having their own. Lancaster County, which does not have its own health department, has seen the highest number of cases, believed to be mostly among the Amish or similar religious groups who have historically low rates of MMR vaccine uptake.
Jeanne Franklin, director of Chester County's health department, said her county, which has the third highest number of cases at 83, is preparing for an influx from neighbouring Lancaster. "We have a very long border with Lancaster county, and these types of disease don't care about borders," Franklin said. "It's going to keep going and find a person who isn't vaccinated."
Franklin noted that many Amish people have not been vaccinated not because they are anti-vaxxers, but because they were either unaware or do not seek healthcare frequently. Chester County is working to dispel misinformation, including claims that the vaccine causes sterility or contains microchips. Franklin said having its own health department gives the county an infrastructure advantage in stopping the spread.