Pneumocystis carinii pneumonitis: a serological study

Area of Science:

• Medical Microbiology
• Immunology
• Infectious Diseases

Background:

• Pneumocystis carinii pneumonitis (PCP) is a significant opportunistic infection.
• Immunosuppressed patients, particularly those with acute lymphoblastic leukaemia, are at high risk for PCP.

Purpose of the Study:

• To examine antibody levels to Pneumocystis carinii in patients with suspected or confirmed PCP.
• To assess the diagnostic utility of antibody detection in PCP cases.

Main Methods:

• Indirect immunofluorescence assay was used to detect antibodies to Pneumocystis carinii.
• Sera were collected from 23 patients with PCP and 91 normal individuals.

Main Results:

• Low levels of antibody to P. carinii were detected in 51 out of 91 normal individuals.
• Elevated or rising antibody titers were found in 18 out of 21 PCP cases with paired or serial sera.

Conclusions:

• Antibody detection using indirect immunofluorescence shows promise for diagnosing Pneumocystis carinii pneumonitis.
• The findings suggest a role for serological testing in the management of PCP in immunosuppressed patients.