WASHINGTON, Nov 1, 2019 (BSS/AFP) – Measles, the contagious childhood
disease that is once more on the rise globally, is more harmful than
previously thought.
A new analysis of 77 unvaccinated children from the Netherlands carried
out by an international team of researchers led by scientists at Harvard has
found that the virus erases the body’s memory of previous pathogens —
effectively wiping its immunity memory.
The virus eliminated between 11 and 73 percent of the children’s
protective antibodies, blood proteins responsible for “remembering” previous
encounters with disease, the team wrote in the journal Science on Thursday.
This left some of the children with immunity close to that of a newborn
baby.
“It sort of resets your immune system back to sort of a more naive state,”
Harvard epidemiologist and coauthor Michael Mena told AFP.
In order to rebuild their defenses, they will need to be exposed to
numerous pathogens as they were in their infancy, he added.
To validate their result, the team then carried out experiments on macaque
monkeys, with the animals losing 40-60 percent of their protective
antibodies.
“The virus is much more deleterious than we realized, which means the
vaccine is that much more valuable,” said study coauthor and Howard Hughes
Medical Institute Investigator Stephen Elledge.