The profoundly corrupt University of Medicine and Dentistry of New Jersey (read UD‘s many posts about it here) has lost track of some mice.

The frozen remains of two lab mice infected with deadly strains of plague were lost at a bioterror research facility at the University of Medicine and Dentistry of New Jersey in Newark — the same high-security lab where three infected mice went missing four years ago.

The latest incident, which led to an FBI investigation, occurred in December but was never disclosed to the public.

University officials said there was no health threat.

The remains of the dead mice were contained in a red hazardous waste bag being stored in a locked freezer, according to the researchers. But an animal care supervisor could not account for them while preparing to sterilize and incinerate them.

In September 2005, the same lab discovered three live mice infected with plague missing from multiple cages. Officials then said the animals had likely died.

University officials yesterday said they immediately contacted the Centers for Disease Control and Prevention, the FBI and state health officials in December upon learning of the missing remains, but withheld information from the public until The Star-Ledger began asking questions. They subsequently released a report about the matter in a mass e-mailing to the university community, saying they did not want employees, students and professors to read about the incident in the newspaper.

FBI officials confirmed the December incident.

“As a matter of protocol in this type of matter, the FBI was called in to investigate and we determined there was no nexus to terrorism or risk to public health,” said Bryan Travers, a spokesman for the FBI office in Newark.

The state Department of Health and Senior Services said it had also been notified of the situation, “and we are very confident that the appropriate authorities are investigating,” said spokeswoman Donna Leusner.

University officials defended their decision to keep the matter confidential.

… … Richard H. Ebright, a Rutgers University microbiologist who has been a critic of the government’s rapid expansion of bioterrorism labs, said while the likelihood is that someone made an accounting error, it was a potentially embarrassing situation for UMDNJ.