A new study shows the H5N1 virus is likely more widespread in cows than had been reported. Since the outbreak was first reported in dairy cows last March, 70 people have been infected and one person has died.

No new human cases of avian influenza have been reported, and poultry infections are low so far in March. But infections in cats are continuing, and new research is raising concerns about the virus

While the risk of infection is low, the detection of the virus across multiple farms is a reminder to take precautions, San Bernardino County health officials say.