In an online update, the Food and Drug Administration said an initial set of tests looking for live virus, not just genetic fragments, suggested that the pasteurization process was effectively neutralizing the pathogen.
These results reaffirm our assessment that the commercial milk supply is safe, the F.D.A. wrote in the update, adding that the testing efforts were ongoing.
Officials also tested infant and toddler formula, which incorporate powdered dairy, and did not find the virus, the agency wrote.
Government scientists have been testing 297 samples of retail dairy products from 38 states, a swath of the country that covers regions far beyond the nine states known to have infected herds.
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