Fallen vaccination rates pose a threat to this vulnerable population.
Review study examines why people are suffering heart attacks during high intensity and endurance exercises such as marathons and triathlons.
Unvaccinated children who contracted the illness lost their immunity to many other infections.
Rats struggle to solve a maze after their uteruses are removed, raising questions about the impacts of the widespread procedure in humans.
Checkpoint inhibitors lift the brakes on the immune system, but may join other new drugs in pressing the accelerator on health care costs.