Antiviral compound may protect brain from pathogens, West Nile virus study shows

Studying West Nile virus infection in mice, scientists at Washington University School of
Medicine in St. Louis showed that interferon-lambda tightens the blood-brain barrier, making it harder for the virus to invade the brain.

The blood-brain barrier is a natural defense system that is supposed
to keep pathogens out of the brain. Sometimes, however, bacteria or
viruses circulating in the blood slip past the blood-brain barrier,
turning routine illnesses into serious infections.

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