Abstract
This study was performed as a contribution for a better understanding of Chlamydia pneumoniae frequency in children with respiratory infections. A total of 416 children were recruited from two clinical centers in Sao Luis, Brazil. Of these patients, 165 children had upper respiratory tract infections (URTI), 150 had community-acquired pneumonia (CAP), and 101 were asymptomatic volunteer children. Clinical and epidemiological data from the participants were recorded. Nasopharyngeal swab samples were collected to extract DNA. C. pneumoniae DNA positivity and copy numbers were obtained by an absolute quantitative real-time PCR method.
Results
Positivity for C. pneumoniae DNA was higher in samples from URTI children (38.2%) and from CAP children (18.0%) than in those from the control group (7.9%; p < 0.001). Moreover, C. pneumoniae DNA was denser in children with URTI than in asymptomatic children. Considering the cutoff, the highest value of C. pneumoniae DNA found in asymptomatic children of the 3.98 log10 copies/mL, 8.5% (14/165) of the children with URTI, and 3.3% (5/150) with CAP presented high copy numbers of C. pneumoniae DNA.
Conclusion
Taken together, these results revealed a high frequency of C. pneumoniae in both children with URTI and CAP.
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Funding
This study was supported by grants from the Ministério da Saúde-CNPq-FAPEMA, Brazil (#PPSUS-03384/13). LGLN, MSA, ESAS, KKPF, and MSC are recipients of fellowships from Fundação de Amparo à pesquisa do Estado do Maranhão (FAPEMA), and MHH and RDCH are recipients of fellowships from Conselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq), Brazil.
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Each author has contributed significantly to this work. EMS, AGA, LAC, ICPAS, MER, MHH, and LGLN contributed to the conception and the design of the work. MSA, MSC, HLSF, ESAS, KKPF, EMS, AGA, GMB, and LGLN contributed to data acquisition and in performing the experiments. SGM, MHH, RDCH, and LGLN analyzed the data. LAC, MER, RDCH, GMB, and LGLN wrote the manuscript. AGA, LAC, MER, RDCH, GMB, and LGLN revised it critically for important intellectual content and final approval of the version to be published.
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This study was approved by the Research Ethics Committee of Ceuma University under the Certificate of Presentation for Ethical Consideration (CAAE #467.131) and was in compliance with the guidelines of the Declaration of Helsinki. Written informed consent was obtained from parents or caregivers prior to enrollment.
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The authors declare that they have no competing interests.
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Alves, M.S., da Silva Cariolano, M., dos Santos Ferreira, H.L. et al. High frequency of Chlamydia pneumoniae and risk factors in children with acute respiratory infection. Braz J Microbiol 51, 629–636 (2020). https://doi.org/10.1007/s42770-020-00229-w
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DOI: https://doi.org/10.1007/s42770-020-00229-w