Nasopharyngeal carriage of Streptococcus pneumoniae in children under 5 years of age before introduction of pneumococcal vaccine (PCV10) in urban and rural districts in Pakistan
Autor: | Lindsay Kim, Anita K. M. Zaidi, Atif Riaz, Omar Irfan, Muhammad Imran Nisar, Tauseef Akhund, Sehrish Muneer, Fyezah Jehan, Sadia Shakoor, Asad Ali, Kanwal Nayani, Aneeta Hotwani, Velusamy Srinivasan, Cynthia G. Whitney, Furqan Kabir, Sana Muslim |
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Rok vydání: | 2018 |
Předmět: |
Serotype
medicine.medical_specialty education 030231 tropical medicine PCV10 medicine.disease_cause Pneumococcal conjugate vaccine lcsh:Infectious and parasitic diseases 03 medical and health sciences 0302 clinical medicine Medical microbiology Internal medicine Streptococcus pneumoniae Medicine Pakistan lcsh:RC109-216 030212 general & internal medicine Pneumococcal carriage Introduction business.industry 3. Good health Infectious Diseases Carriage Parasitology Pneumococcal vaccine Tropical medicine business medicine.drug |
Zdroj: | BMC Infectious Diseases, Vol 18, Iss 1, Pp 1-8 (2018) |
ISSN: | 1471-2334 |
Popis: | Background Benefits of pneumococcal conjugate vaccine programs have been linked to the vaccine’s ability to disrupt nasopharyngeal carriage and transmission. The 10-valent pneumococcal vaccine (PCV10) was included in the Expanded Program on Immunization (EPI) in Sindh, Pakistan in February 2013. This study was carried out immediately before PCV10 introduction to establish baseline pneumococcal carriage and prevalent serotypes in young children and to determine if carriage differed in urban and rural communities. Methods Nasopharyngeal specimens were collected from a random sample of children 3-11 and 12-59 months of age in an urban community (Karachi) and children 3-11 months of age in a rural community (Matiari). Samples were processed in a research laboratory in Karachi. Samples were transported in STGG media, enriched in Todd Hewitt broth, rabbit serum and yeast extract, cultured on 5% sheep blood agar, and serotyped using the CDC standardized sequential multiplex PCR assay. Serotypes were categorized into PCV10-type and non-vaccine types. Results We enrolled 670 children. Pneumococci were detected in 73.6% and 79.5 % of children in the infant group in Karachi and Matiari, respectively, and 78.2% of children 12 to 59 months of age in Karachi. In infants, 38.9% and 33.5% of those carrying pneumococci in Karachi and Matiari, respectively, had PCV10 types. In the older age group in Karachi, the proportion was 30.7%, not significantly different from infants. The most common serotypes were 6A, 23F, 19A, 6B and 19F. Conclusion We found that about 3 of 4 children carried pneumococci, and this figure did not vary with age group or urban or rural residence. Planned annual surveys in the same communities will inform change in carriage of PCV10 serotype pneumococci after the introduction and uptake of PCV10 in these communities |
Databáze: | OpenAIRE |
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