How Trump’s vaccine plan would be a logistical nightmare for parents and drug manufacturers

Public health experts have been quick to condemn an executive order from President Donald Trump aimed at upending childhood vaccinations in the U.S., but the biggest obstacles may be the unprecedented financial and logistical challenges it would impose on parents, health providers and drugmakers.Monday’s announcement by the Republican president calls for separating combination shots — including the measles, mumps and rubella, or MMR, vaccine — into separate injections. Appointments for tha...