President Donald Trump signs an executive order revising national childhood vaccine recommendations. The order calls for reducing the number of vaccines universally recommended for children and changes measles, mumps and rubella immunization by replacing the combined MMR shot with three separate injections given over separate visits.

The World Health Organization says the Ebola outbreak in eastern Democratic Republic of Congo begins in February, months before it is officially declared in May. The agency bases that revised timeline on analysis of early virus data, raising concern about how long the outbreak spreads before public health authorities formally identify it.