Study found that the blood of chickens given the drug contained low levels of a ##xin . Suspension does not kick in for 30 days . Pfizer says that delay will give time for producers to transition to other marketing strategies , according to the FDA .
Study found that the livers of chickens given the drug contained low levels of a carcinogen . Suspension does not kick in for 30 days . Pfizer says that delay will give time for producers to transition to other treatment strategies , according to the FDA .