. A large commercial layer flock in southern California experiences a sudden increase in mortality and an abrupt decrease in egg production. The affected birds are cyanotic and have dyspnea and violent diarrhea. A few of the birds have conjunctivitis or pronounced nervous signs. Postmortem examination of sample birds shows marked tracheitis, acute airsacculitis, serosal hemorrhages, and prominent hemorrhages along the gastrointestinal tract, primarily involving lymphoid tissue. Which of the following is the most appropriate next step?
(A) Inform the owner that the outbreak will subside spontaneously
(B) Prepare to vaccinate other flocks in the immediate area for infectious laryngotracheitis
(C) Report the disease outbreak to the state/provincial veterinarian immediately
(D) Treat the birds with a broad-spectrum antibiotic in the drinking water
(E) Withdraw feed immediately and replace with new feed
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