Keywords
whooping cough
pulsed field gel electrophoresis
real-time PCR
How to Cite
Abstract
Pertussis is a highly contagious respiratory disease caused by Bordetella pertussis. This study aimed at characterizing the B. pertussis laboratory positivity and the isolated strains in municipalities of the Central-West Region of São Paulo State, Brazil from 2010 to 2014. A total of 597 nasopharyngeal swabs samples were collected from suspected patients and contacts, and analyzed by in vitro culture and Real-Time PCR (qPCR). Culture-positive B. pertussis strains were characterized by serotyping and pulsed-field gel electrophoresis. Considering culture and/ or qPCR, the positivity rate was of 19.6%. Out of 117 samples with B. pertussis, 23 were detected by both methods, 89 by qPCR only and five by culture only. Strains presenting FIM3 (40%), FIM2,3 (32%) and FIM2 (28%) serotypes were found. Five pulsotypes were detected by PFGE, 48% of which identified as BP.Xba.0039, being the predominant type in this study. Among the positive strains, 50% were isolated from < 2 months old-children and 17% were isolated from three to six months old patients. Non-vaccinated children or with incomplete vaccination schedule were at the major risk of complications and death, highlighting the importance of a continuous monitoring of this infection for the future control strategies.References
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