Diphtheria in Children- Clinical Profile of Cases during an Outbreak in Kerala, India

Abstract

Introduction: Diphtheria is an acute potentially fatal infectious disease caused by the toxigenic strains of Corynebacterium diphtheriae. Acute respiratory obstruction, toxic myocarditis and neurologic weakness are the most important complications of diphtheria. The clinical presentation and severity of diphtheria vary in immunised and non immunised children. Early diagnosis and prompt treatment including administration of diphtheria antitoxin and antibiotics minimise mortality. Aim: To observe the changing trends in the clinical presentation of diphtheria during the 2016 outbreak and its association with immunisation status and antitoxin administration. Materials and Methods: This longitudinal prospective study was conducted among children admitted to Government Medical College, Kozhikode, Kerala, a tertiary care centre with a diagnosis of diphtheria during January 2016 to December 2016. Details of socio-demographic data, clinical presentation, investigations, immunisation status, treatment and complications were collected using a semi-structured performa. These children were managed by an interim guideline provided by the state authorities. They were followed-up for 3 months i.e. till March 2017. The data was analysed using Statistical Package for Social Sciences (SPSS), version 18.0. Results: Among 76 children, 62(81.6%) were from Malappuram and Kozhikode districts, which have relatively low immunisation coverage. Most admissions were in July 2016. Majority 58 (76.3%) of children belonged to Muslim community. The mean age was 8.1 years with male to female ratio 1.53:1. Most of the children 47 (61.8%) were unimmunised or partially immunised. Cultures were positive for C. diphtheriae in 20 children. Complications were noted in 36 children, which included asymptomatic myocarditis in 31, symptomatic myocarditis in one, palatal palsy in nine, loss of accommodation in four and distal weakness in five. Only one child who received antitoxin within 72 hours of disease onset developed neurological complications. Complications were common in children who received less than minimum three doses of diphtheria vaccines compared to those who received three or more doses (54% vs. 44%). There was no mortality. Conclusion: There was an upward shift in age of affected children. Neurological complications were significantly less in those who received antitoxin within 72 hours of disease onset. Regular monitoring helped to detect asymptomatic myocarditis. The outbreak highlighted the need to improve awareness about diphtheria and better vaccination coverage, especially in older children.

Keywords

• clinical presentation
• complications
• diphtheria antitoxin
• immunisation status
• vaccination