US is criticized for the lack of shared genetic information and clarity on the spread of H5N1 in dairy cows, with unclear links between affected herds and states.
Possible cow-to-cow transmission of H5N1 is suspected through contaminated milking equipment, even as symptomatic cows show few respiratory signs, raising concerns about silent spread.
Reported cases suggest asymptomatic transmission of H5N1, urging testing for clinical symptoms in herds; USDA reimburses farms for testing asymptomatic cows, adding to uncertainties.
Research indicates H5N1 can spread through cattle movements, posing questions on how the virus transmits between cows despite limited respiratory symptoms in infected cows.
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