The coalition Keep Antibiotics Working has asked FDA for further explanation. The group says the agency failed to explain why the reduction occurred, why new data were submitted after the March 31 deadline, or how a late submission could decrease the overall amount.
"The FDA's explanation raises more questions than it answers," said coalition member Steven Roach of the Food Animal Concerns Trust. "How could a late submission result in such a huge drop in drug sales?"
The coalition is also asking the FDA to break the data out by route of administration (feed, water, or injection) or purpose (therapy, prevention, or growth promotion).