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.

Authorities in New York state have temporarily closed all live poultry markets in New York City and three suburban counties after detecting bird flu at seven markets within the past week, according to a notice on Friday.