A bird flu-related shutdown of all live poultry markets in New York City, Westchester County and Long Island starts today.

The unusual order follows an outbreak of bird flu at an Aquebogue duck farm and detections of the disease in markets in Queens, the Bronx and Brooklyn.

All live poultry markets in New York City and some of its suburbs were ordered Friday to close for a week after the detection of seven cases of avian flu, which has also hit farms nationwide, led to the slaughter of millions of birds and driven up egg prices.