Open conflict broke out among U.S. liver transplant centers this week, with doctors and patients in less populous parts of the country seeking a contempt of court order against the Health and Human Services Department and the nonprofit organization that runs the transplant system.

A Kentucky teenager banned from school earlier this year because he lacked the chickenpox vaccine contracted the disease last month, according to his father, who says it’s the “best thing to do” to become immune.

The so-called fetal “heartbeat” laws ban abortion before many women even know they’re pregnant.

Stanford University has cleared Stephen Quake, a bioengineering professor, of any wrongdoing in his interactions with a Chinese researcher who roiled the scientific world by creating the first gene-edited babies.

New York City health officials issued summonses to parents of three children Thursday for failing to have their children vaccinated against measles, a violation of the city’s emergency ordermandating immunizations to control a surging outbreak.

The Food and Drug Administration promised yesterday to heighten oversight of providers of experimental stem cell treatments, as a Post report detailed the agency’s slow response to a leading stem cell company whose treatments blinded some patients.

A mumps outbreak that began at Philadelphia’s Temple University in February has snowballed, with the city’s health department now reporting 106 cases associated with the flare-up.

University officials say the vast majority of students involved had been immunized previously with the MMR vaccine, which protects against measles, mumps and rubella.

So why are so many still appearing on campus with the mumps’ signature swollen cheeks?

A county in New York has banned unvaccinated children from all public spaces as the state battles its largest measles outbreak in decades.

Officials in Rockland County declared a state of emergency Tuesday, announcing that the ban would begin at midnight and remain in place for 30 days, or until unvaccinated minors receive the measles, mumps and rubella (MMR) vaccine. Officials said unvaccinated minors will not be permitted in public places, such as churches, schools and shopping centers, though outdoor spaces such as playgrounds are not included in the ban.