Construction work was apparent at the Abbott Nutrition's plant on Centreville Road last week.
Congress is now investigating contamination at the baby formula production facility after infant deaths and infections.
Connecticut Democratic Rep. Rosa DeLauro revealed in a statement Thursday that a whistleblower sent the FDA a 34-page document outlining potential concerns with the Sturgis plant in October.
The congresswoman said in her statement that a former plant employee accused the plant management of hiding information during a 2019 FDA audit. The whistleblower also cited lax cleaning practices, falsifying records and releasing untested infant formula.
DeLauro and other members of Congress now want to know why the FDA didn't take action earlier.
Abbott said in a statement after it shut down baby formula production following an inspection by the Food and Drug Administration from Jan. 31 to March 18, "We are currently reviewing the U.S. FDA's 483 observations from the inspection of our powder formula manufacturing in our Sturgis, Mich., facility. We're taking this very seriously and are working closely with the FDA to implement corrective actions."
The FDA investigation began after one infant death and two serious infections were reported. The FDA added a second death and several more illnesses to the investigation.
The FDA said a "Cronobacter infection may have contributed to the cause of death for both patients."
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