Scientists who know about the types of pathogens — E. coli and Salmonella among them — that can be transmitted in raw milk generally think drinking unpasteurized milk is a bad idea. But right now, they believe, the danger associated with raw milk may have gone to a whole new level.

“If I were in charge, for the moment I would forbid the selling of raw milk,” said Thijs Kuiken, a pathologist in the department of viroscience at Erasmus Medical Center in Rotterdam, the Netherlands, who has done research on H5N1 and the damage it inflicts for about two decades.