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Canadian Journal of Infectious Diseases and Medical Microbiology - Volume 24 2013, Issue 1, Pages e1-e6

Original Article

Infectious Disease Division, Department of Pediatrics and Medical Microbiology, The Montreal Children’s Hospital, McGill University, Montreal, Canada

Canadian Food Inspection Agency, St Hyacinthe Laboratory, St Hyacinthe, Canada

Department of Epidemiology and Biostatistics, McGill University, Montreal, Quebec, Canada



Copyright © 2013 Hindawi Publishing Corporation. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

Abstract

BACKGROUND: A publicly funded, group A rotavirus RVA vaccination program was implemented in Quebec in November 2011.

OBJECTIVES: To evaluate trends in RVA infections and describe circulating genotypes before the implementation of a publicly funded vaccination program.

METHODS: The Montreal Children’s Hospital Montreal, Quebec virology laboratory database was reviewed for RVA ELISA performed between July 2006 and June 2011. A five-week moving average was used to follow the proportion of positive RVA ELISA test results. A season was defined as starting with the first two and ending with the final two consecutive weeks in which the percentage of specimens testing positive for RVA was ≥10%. Duplicate tests were excluded. A random sample of 39 RVA-positive fecal samples from the final season 2010-2011 was genetically characterized: VP4, VP6, VP7 and NSP4 gene segments were genotyped using sequence analysis.

RESULTS: Of the 3403 nonduplicate tests, 433 were RVA positive: 15.1% 2006-2007 to 9.3% 2010-2011 of the samples were positive during the study period, with a proportionally larger decrease in the percentage of positive tests compared with the decrease in the number of tests performed. The most common RVA strain types detected were G9P8I1 n=19 and G1P8I1 n=14, followed by G2P4I2 n=4, G3P6I1 n=1 and G4P8I2 n=1. Mixed RVA infection was observed in two samples.

CONCLUSION: Before the implementation of the vaccination program, the proportion of positive RVA tests had already begun to steadily decline. The present study was the first to report the genetic makeup of human RVA collected from a Canadian hospital based on the genotyping of four gene segments. The present study provided a baseline with which to monitor the impact of the universal vaccination program.





Autor: Estelle Chetrit, Yvan L’Homme, Jagdip Singh Sohal, and Caroline Quach

Fuente: https://www.hindawi.com/



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