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Mycoplasma pneumoniae in children with pneumonia at Mbagathi District Hospital, Nairobi
1Centre for Microbiology Research, Kenya Medical Research Institute, Nairobi, Kenya.
Objective:
To determine the prevalence of mycoplasma pneumoniae in nasopharyngeal aspirates of children under five years of age suffering from pneumonia.
Design:
Cross-sectional survey.
Methods:
Two primer sets targeting the genes coding for adhesion protein and 16S rRNA were used in PCR and M. pneumoniae specific antibodies were detected using commercial article agglutination kit. Microbiological investigations to isolate common acute respiratory infectious pathogens were also carried out.
Results:
M. pneumoniae was detected in nasopharyngeal aspirates of 33.7% of the cases by PCR while serology was positive in only 4.1%. M. pneumoniae alone (single detection) was detected in 25% of the cases while 75% occurred with other acute respiratory infectious (ARI) pathogens. However, the results did not correlate with clinical outcome or the severity of pneumonia. No significant aetiology was found in 28% of the cases investigated, however microbiological investigations by culture revealed the presence of other aetiological agents as follows: Streptococcus pneumoniae (26%), Klebsiella pneumoniae (1%), Staphylococcus aureus (3%), E. coli (2%), parainfluenza viruses (5%), Salmonella(1%), adenovirus (4%), RSV (22%) and Candida spp(13%), Mycoplasma pneumoniae was more prevalent in children aged between six months and three years. Cases of M. pneumoniae PCR positive and S. pneumoniae exhibited similar seasonal distribution with peaks in May and September. However, there was no relationship between M. pneumoniae PCR positive and the severity of pneumonia.
Conclusion:
More investigation is required to establish the significance of atypical pathogens in respiratory infections in Kenya.
Insights
Mycoplasma pneumoniae was detected in 33.7% of children under five with pneumonia using PCR. This atypical pathogen was more common in younger children and often co-occurred with other respiratory infections.
Area of Science:
- Pediatrics
- Infectious Diseases
- Microbiology
Background:
- Pneumonia is a leading cause of mortality in children under five.
- The role of atypical pathogens, such as Mycoplasma pneumoniae, in pediatric pneumonia requires further elucidation.
- Understanding the prevalence of specific pathogens is crucial for effective treatment strategies.
Purpose of the Study:
- To determine the prevalence of Mycoplasma pneumoniae in nasopharyngeal aspirates of children under five years of age suffering from pneumonia.
- To investigate the co-occurrence of M. pneumoniae with other common acute respiratory infectious (ARI) pathogens.
- To explore the relationship between M. pneumoniae detection and clinical outcomes.
Main Methods:
- A cross-sectional survey was conducted.
- Polymerase Chain Reaction (PCR) was used to detect M. pneumoniae targeting adhesion protein and 16S rRNA genes.
- Serological tests (antibody detection) and microbiological investigations for common ARI pathogens were also performed.
Main Results:
- Mycoplasma pneumoniae was detected in 33.7% of cases via PCR, significantly higher than serological detection (4.1%).
- M. pneumoniae was detected alone in 25% of cases and concurrently with other ARI pathogens in 75%.
- Prevalence was higher in children aged six months to three years, with seasonal peaks in May and September, but no correlation with pneumonia severity.
Conclusions:
- Mycoplasma pneumoniae is a prevalent pathogen in pediatric pneumonia in the studied population.
- The high rate of co-detection with other ARI pathogens suggests complex etiologies.
- Further research is needed to establish the clinical significance of atypical pathogens in Kenyan respiratory infections.
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