Diphtheria in Andhra Pradesh-a clinical-epidemiological study

Area of Science:

• Infectious Diseases
• Public Health
• Microbiology

Background:

• Clinical diphtheria is experiencing a global resurgence, disproportionately impacting developing nations.
• Understanding diphtheria's clinical spectrum in diverse patient populations is crucial for effective management.

Purpose of the Study:

• To investigate the clinical presentation, morbidity, and mortality of diphtheria patients.
• To compare outcomes between immunized and non-immunized individuals.
• To identify etiological agents, including Corynebacterium diphtheriae (CD) and other Corynebacterium species (COD).

Main Methods:

• Retrospective analysis of 2925 clinical diphtheria cases admitted between January 2008 and December 2012.
• Data collection included patient demographics, clinical signs, immunization status, microbiological cultures, and outcomes (morbidity, mortality).
• Comparison of disease characteristics based on immunization status and causative bacterial species.

Main Results:

• Immunization was associated with milder diphtheria presentation and complete recovery.
• Corynebacterium diphtheriae (CD) infection was more severe and frequently fatal, particularly in non-immunized patients and children under 5.
• Infections with other Corynebacterium species (COD) generally resulted in mild disease and full recovery, irrespective of immunization status.

Conclusions:

• Diphtheria's clinical course and severity are significantly influenced by immunization status.
• Corynebacterium diphtheriae remains a significant threat, causing potentially deadly disease, while COD infections are considerably less severe.
• Public health strategies should emphasize vaccination to mitigate diphtheria's impact, especially in vulnerable populations.