Measles cases in the US have reached their highest in 25 years. A bioethicist argues why parents opposed to vaccination are not just wrong about the science, but about the morals.
Vaccinating against an infectious disease can stop once the threat of future transmission is deemed sufficiently low.
Polio for years has been close to becoming eradicated, with the entire continent of Africa going two years without a reported case – until early August. Here's why eradication is hard but attainable.