Herd immunity occurs when enough people in a group are immune to a specific infection that it cannot spread easily from person to person. Vaccination programs have been successful in creating herd ...

To stop the spread of an infectious disease like measles, you don’t have to vaccinate everyone. But you do have to vaccinate many. Just how many? To let you discover for yourself, we simulated an ...

The UK Health Security Agency (UKHSA) has warned of an increased risk of measles outbreaks, particularly in London. Although the probability of a large epidemic is still considered to be low elsewhere ...

Minnesota’s youngest schoolchildren have been below the recommended 95% threshold for years, and more parents are getting exemptions for the MMR vaccine. Where are children most vulnerable to ...

After nearly three years of keeping COVID under control, China is experiencing a massive new wave of COVID infections. The official figures reporting 60,000 deaths between December 8 and January 12 ...