The virus was detected after more than 100 chickens died near Mandalay earlier this month, according to Than Tun, director of animal health.
But there is no evidence of human infection, according to the Food and Agriculture Organisation (FAO).
At least 97 people have died from bird flu since the disease's resurgence in 2003, two-thirds of them in Indonesia and Vietnam.
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Avian flu
Bird flu
H5N1
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