Diagnosis of pertussis

Area of Science:

• Medical Microbiology
• Immunology
• Epidemiology

Background:

• Pertussis, or whooping cough, remains a significant public health concern, particularly during outbreaks.
• Traditional diagnostic methods like bacterial culture have limitations in sensitivity and speed.
• Rapid and accurate diagnosis is crucial for effective disease control and patient management.

Purpose of the Study:

• To compare the diagnostic efficacy of enzyme-linked immunosorbent assay (ELISA) with bacterial isolation for pertussis.
• To evaluate ELISA's utility in diagnosing pertussis during a community outbreak.

Main Methods:

• A study involving 71 patients with suspected whooping cough and 25 household contacts during a local pertussis outbreak.
• Collection of serum samples and nasopharyngeal swabs for analysis.
• Utilized five different culture media for bacterial isolation and performed ELISA for IgM and IgA antibodies against Bordetella pertussis.

Main Results:

• ELISA diagnosed 28 cases within 2 days using initial serum samples and identified 50 cases with paired serum samples.
• Bacterial cultures yielded positive results in only nine patients.
• ELISA demonstrated significantly higher diagnostic yield compared to bacterial isolation.

Conclusions:

• Enzyme-linked immunosorbent assay (ELISA) is a valuable and sensitive diagnostic method for pertussis.
• ELISA is particularly effective in diagnosing pertussis in cases where bacterial cultures are negative.
• The findings support the integration of ELISA into diagnostic algorithms for pertussis, especially during outbreaks.