State health officials have extended the closing of Ameridose for six weeks, the Boston Globe reports.

The Globe reports the state Department of Public Health said in a statement that the Westborough drug company will continue undergoing a joint state and federal investigation regarding “unsanitary conditions and questionable sterility practices at the facility."

Ameridose shares owners with the New England Compounding Center, a specialty pharmacy in Framingham linked to the national deadly meningitis outbreak.

On Oct. 10, the Massachusetts Board of Registration in Pharmacy reached an agreement with Ameridose to close so that investigators could determine if its products had also been contaminated.

In November, federal Food and Drug Administration inspectors reported seeing insects and a bird while inspecting Ameridose.