The new case, in a Michigan farmworker, did not suggest that bird flu was widespread in people, health officials said, adding that the risk to the general public remained low.
When a child in a small Cambodian town fell sick recently, his rapid decline set off a global disease surveillance system.
Members of a team from Cambodiaβs Ministry of Agriculture took a swab from a duck during surveillance of the poultry section of the Orussey market in Phnom Penh this month.
The exact number of chickens, cows and pigs being transported on trucks, ships, planes and trains within the United States is difficult to pinpoint because there is no national system for tracking the movement of livestock.
The Food and Drug Administration said regulators had examined 201 commercial dairy samples, including milk, cottage cheese and sour cream, and had so far not found evidence that potentially infectious virus was on grocery shelves.