The researchers studied blood plasma samples from seven donors infected with the AIDS virus.

The inspector cited a case in the Connecticut region in which a donor infected with AIDS did not have his donor records updated after the infection occurred, and contaminated blood was sent out.

Two more patients who received transplants from a donor infected with AIDS have tested positive for the virus in preliminary examinations, the service that processed the donor's tissue said today.

To the Editor: Recently, three patients died of acquired immune deficiency syndrome, and three others were infected with the human immunodeficiency virus after getting organs from a donor infected with the virus.

Dr. Kerndt's team found only a small number of donors infected with the parasite, but concluded that "there is a small but significant risk of transfusion-related Chagas' disease at blood donor centers in the United States."

The 69-year-old British man who died was one of 48 people who received blood from 15 donors infected with the human form of mad cow disease.

One of Dr. Laks's patients, a 70-year-old man with a failing heart from a previous transplant, gladly accepted an otherwise healthy heart from a donor infected with hepatitis C. The disease could slowly damage the recipient's liver, causing serious health risks in 5 to 10 years.

The U.S. Centers for Disease Control announce that three organ transplant recipients have died from rabies infection after receiving organs from a donor infected with the rabies virus.

The intent was to identify donors potentially infected with Hepatitis C because there was no specific test for that disease at the time.

Blood from a donor infected within the past three months would not be picked out because the test detected antibodies that are not produced for three months.