Canada has been experiencing a large measles outbreak. More than half of the cases may be among people who have been “fully” vaccinated—that is, they had received all the mandated doses.
Measles is supposed to be a disease of the past, one that’s been wiped out by vaccines. What went wrong?
All sorts of excuses are being made, from blaming the unvaccinated to blaming immigrants to suggesting that the vaccine schedule isn’t aggressive enough to wondering if a pool of “susceptibles” has been building up over the years.
Studies of the Canadian measles outbreak were presented at a meeting of the Infectious Diseases Society of America this month. Dr. Gaston De Serres, an infectious diseases expert with the Quebec’s public health agency, is the lead author of one the studies, “Lower than expected vaccine efficacy in two-dose recipients and higher risk with younger age at first dose.” He states that the real question is, “How could it have happened?” He was referring to 52 of 98 measles cases in teens who’d been fully vaccinated.