This dilution factor was an important piece of data considered in
the multi-agency science-based human risk analysis and helps to
support the conclusion that there is very low risk to human health
from eating meat from animals that were fed the contaminated
product. This conclusion supports the decision announced on April 28
not to recall meat from animals that were fed contaminated product.
Currently, swine and poultry on farms suspected of receiving
contaminated feed are being held under state quarantine or
voluntarily by the owners. In several cases, feed samples have
tested negative for melamine and related compounds. These tests were
conducted by federal laboratories or state laboratories using
approved methods. It is assumed that because only small amounts of
the contaminated feed were mixed with other rations, the melamine
and related compounds were no longer detectable. USDA has concluded
that, based on the human risk assessment and the inability to detect
melamine in the feed samples, these animals no longer need to be
quarantined or withheld from processing.
In other cases, feed samples have tested positive for melamine
and related compounds; feed samples were not available; or feed
samples have not yet been submitted for testing. These animals
continue to be withheld from processing, but are not yet being
culled, pending the results of the animal risk assessment. This
assessment is expected to be completed within one week. At that
time, USDA will determine whether these animals can be released for
inspection and further processing.
USDA and FDA continue to conduct a full and comprehensive
investigation. As additional information is confirmed, updates will
be provided and decisions will be made using the best available
science to protect the public's health.
To ensure no further contaminated products enter the U.S., the
federal government will continue to monitor imported wheat and corn
gluten as well as rice protein concentrate and isolates arriving
from all countries [and] destined for human and animal consumption.
The FDA import alert for these products sourced from China remains
in effect and U.S. Customs and Border Protection will continue
laboratory testing of the products as they enter the U.S. The
inspections are a precautionary measure to ensure the safety of
products entering at U.S. ports of entry. There is no evidence to
suggest products bound for the human food supply are contaminated.
For additional information about the pet food and contaminated
feed investigation, go to www.fda.gov
or www.usda.gov. The human
safety/risk assessment will be available online upon completion of
an executive summary.
USDA Fact Sheet : Melamine and Analogues Safety/Risk Assessment