Related Experiment Videos
Sudden unexplained death syndrome--a new manifestation in melioidosis?
1Department of Microbiology, National University of Singapore, Kent Ridge.
Abstract:
The indirect haemagglutination (IHA) test using sensitized turkey erythrocytes and the indirect immunofluorescence assay (IgM-IFA) was confirmed to be sensitive in the detection of a recent or current Pseudomonas pseudomallei infection in 19 culture-confirmed Singapore melioidosis patients. All were found to have antibody titres from 4 to 32768 in the IHA test and 10 to 320 in the IgM-IFA test. When these tests were employed on sera from 16 immigrant Thai construction workers who died of sudden unexplained death syndrome (SUDS) and 73 healthy Thai fellow workers, 93.8% and 68.8% of SUDS cases had IHA titre of greater than or equal to 4 and IgM-IFA titre of greater than or equal to 10 respectively, in contrast to 39.7% and 12.3% found among healthy Thai workers. These data indicate that at the time of death, most of the SUDS patients had an active infection with P. pseudomallei, possibly resulting from reactivation of a latent infection. The aetiological role of P. pseudomallei as the major cause of SUDS is discussed.
Insights
The indirect haemagglutination (IHA) and indirect immunofluorescence assay (IgM-IFA) tests effectively detect recent Pseudomonas pseudomallei infections. These tests suggest P. pseudomallei is a major cause of sudden unexplained death syndrome (SUDS) in Thai workers.
Area of Science:
- Medical Microbiology
- Infectious Diseases
- Epidemiology
Background:
- Melioidosis, caused by Pseudomonas pseudomallei, is a significant infectious disease.
- Sudden Unexplained Death Syndrome (SUDS) is a concern in certain populations, with its etiology often unclear.
- Diagnostic tools are crucial for identifying P. pseudomallei infections and understanding disease outbreaks.
Purpose of the Study:
- To evaluate the sensitivity of indirect haemagglutination (IHA) and indirect immunofluorescence assay (IgM-IFA) for detecting recent or current Pseudomonas pseudomallei infections.
- To investigate the potential role of P. pseudomallei as a causative agent in Sudden Unexplained Death Syndrome (SUDS) among Thai construction workers.
- To compare antibody titres in SUDS cases with those in healthy individuals.
Main Methods:
- Utilized indirect haemagglutination (IHA) test with sensitized turkey erythrocytes.
- Employed indirect immunofluorescence assay (IgM-IFA) for antibody detection.
- Analyzed sera from culture-confirmed melioidosis patients, SUDS cases, and healthy controls.
Main Results:
- IHA and IgM-IFA tests showed high sensitivity in detecting P. pseudomallei infection in melioidosis patients (antibody titres up to 32768 and 320, respectively).
- A significant proportion of SUDS cases (93.8% for IHA, 68.8% for IgM-IFA) exhibited elevated antibody titres compared to healthy controls (39.7% for IHA, 12.3% for IgM-IFA).
- These findings suggest active P. pseudomallei infection at the time of death in most SUDS patients, potentially from latent infection reactivation.
Conclusions:
- IHA and IgM-IFA are sensitive diagnostic tools for recent or current Pseudomonas pseudomallei infections.
- Pseudomonas pseudomallei is strongly implicated as a major etiological agent of Sudden Unexplained Death Syndrome (SUDS) in the studied Thai population.
- The results highlight the importance of considering P. pseudomallei in unexplained deaths, possibly due to reactivation of dormant infections.