UPI:

Babies born by C-section are unlikely to receive protection from a single dose of measles vaccine, a new study finds.

A single measles jab is up to 2.6 times more likely to be completely ineffective in C-section babies, compared to those born vaginally. Their immune systems fail to produce antibodies to fight against measles infection.

However, a second follow-up jab does induce robust immunity against measles, researchers report Monday in the journal Nature Microbiology.