BK virus infection in patients with AIDS

Area of Science:

• Immunology
• Virology
• Infectious Diseases

Background:

• The human papovavirus BK (BKV) is a common virus that can cause infections.
• Acquired Immunodeficiency Syndrome (AIDS) is a chronic, potentially life-threatening condition caused by the human immunodeficiency virus (HIV).
• Individuals with AIDS may have weakened immune systems, potentially affecting their response to viral infections.

Purpose of the Study:

• To investigate the prevalence and levels of antibodies to BKV in men with AIDS and AIDS-related complex (ARC).
• To compare BKV antibody status between AIDS patients, ARC patients, and healthy controls.
• To explore potential reasons for altered BKV antibody responses in AIDS patients.

Main Methods:

• Antibody levels to BKV were measured using IgG-enzyme-linked immunosorbent assay (ELISA), hemagglutination inhibition, and neutralization tests.
• Participants included men with AIDS, men with ARC, and healthy male homosexual controls.
• Prevalence and antibody titers were statistically compared between groups.

Main Results:

• AIDS patients exhibited significantly lower prevalence and levels of anti-BKV antibodies compared to ARC patients.
• Approximately half of anti-BKV antibody-positive AIDS patients showed signs of primary infection or reactivation without specific IgM production.
• Antibody titers in AIDS patients were low compared to primary infections observed in children.

Conclusions:

• The prevalence of BKV infection may be underestimated in AIDS patients due to a loss of serological markers.
• This loss of markers can occur even with normal or increased total IgG levels in late-stage disease.
• Altered BKV antibody responses in AIDS patients warrant further investigation into immune system dynamics.