Here are some of the latest health and medical news developments, compiled by the editors of HealthDay:

Insurer Aetna’s Envelopes Revealed Customers’ HIV Status

Customers of health insurance giant Aetna in many states were sent mail with envelopes that clearly revealed their HIV status, says the Legal Action Center and AIDS Law Project of Pennsylvania.

In partnership with six other groups, the two legal organizations are representing the affected customers, who say friends and neighbors discovered their HIV status in this way, the firms said in a news release.

On Thursday, lawyers sent Aetna a demand letter requesting that they cease sending mail in this format, CNN reported.

The mail went to an estimated 12,000 customers, the law firms said, and 23 complaints have so far been received. The Aetna letters were sent July 28 to customers taking HIV medications or drugs meant to prevent infection with the virus that causes AIDS, the legal groups said.

On July 31, the insurance company became aware that private health information was clearly visible through the envelopes’ windows, according to a “notification of privacy breach” letter sent to customers. In that notification, Aetna claimed that the vendor that handled the mail used a windowed envelope, and in some cases the paper inside shifted to make personal health information viewable.

So far, patients in Arizona, California, Georgia, Illinois, New Jersey, New York, Ohio, Pennsylvania and Washington, D.C., have reached out to lawyers, CNN said.

“I know of someone who has been kicked out of his home because somebody who saw his envelope learned his HIV status,” Sally Friedman, legal director of the Legal Action Center, told CNN.

“People with HIV need to feel they can seek medical help without their private information being illegally shared with neighbors, family, etc.,” Friedman added. “So when an insurance company breaches confidentiality in this fashion, it can deter people from getting health care.”