Bird flu vaccination may be the only way to have free-range chickens
Tens of millions of poultry are being kept indoors or have been slaughtered because of avian influenza. Without widespread vaccination of birds, free-range chickens and eggs could be off the menu forever in some countries
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Tens of millions of poultry are being kept indoors or have been slaughtered because of avian influenza. Without widespread vaccination of birds, free-range chickens and eggs could be off the menu forever in some countries
