(Santiago) Chile is scrambling to reach people who could be unknowingly spreading AIDS.

Health Minister Alvaro Erazo told legislators that public health services failed to tell 512 people that they had tested positive for HIV.

Chile’s public health service said some patients provided incorrect addresses, but in about half the cases there is no evidence anyone tried to reach them.

Erazo was summoned to Congress to explain after the scandal forced his predecessor to resign.

Now Chile is launching an intense campaign to locate and inform the patients.

Erazo said it would be done with the most confidentiality possible. But it appears some health workers weren’t getting that message.

In Puerto Montt, a man who refused to be identified by name said two health officials arrived at his workplace in an ambulance, and in the presence of his boss, told him he was HIV-positive.

“I lost my job and my girlfriend” as a result, the man told Radio Cooperativa of Santiago. “My family is broken.”

Of 18,500 AIDS cases registered in Chile since 1984, 5,710 people have died of the disease, Erazo said.