Ocorrência de Genótipos com Características de Rotavírus Humano em amostras de fezes diarréicas de crianças atendidas em Prontos Socorros Infantis do Município de Manaus AM

Abstract

Human rotavirus constitutes one of the most important causes of diarrheic disease in children less than five years in the whole world. With the objective of verifying the occurrence of genotypes of human rotavirus in children of 1 the 36 months residents in the city of Manaus in Amazon, had been analyzed during the years from 2004 to 2006, a total of 607 the feces diarrheic samples that had been collected of children attended hospital of children in the city of Manaus. This analyzes was carried through by the detention of the viral genome through the techniques of EGPA (electrophoresis in gel of polyacrylamide), and RT-PCR (reaction in chain of polymerases associated to the reaction of reversal transcriptase). Through the EGPA method can be observed a positivity of 25% of the human rotavirus samples. All of the positive samples for rotavirus had been genotyped by the method of RT-PCR with use of specific primers for genotypes G (G1, G2, G3, G4 and G9) and genotypes P (P[8], P[4], P[6], P[9] and P[10]). By the genotyping, it was detected genotype G in 30,7% of the positive samples for rotavirus, with predominance of the G2 genotypes (17%), followed of G1 (14.9%) and G9 (10.6%) and genotype P in 44,7% of the positive samples for rotavirus, with predominance of genotypes P[8] in 66,2% of samples and P[4] in 13,2% of the samples. The combinations of genotypes G and P had been responsible for 53,3% of the positive samples for rotavirus, being that P[8]G1 and P[4]G2 had been found with 12,5% and 10% consecutively, followed of P[8]G3 (5%). Other combinations as P[4]G1, P[8]G9 and P[10]G1 had been also found in less expressive numbers. It was observed that 38.3% of the positive samples for genotype G and 11.7% of the positive samples for genotype P had not presented characteristics for none of searched genotypes G and P. The number positive samples for human rotavirus, as well as for genotypes G and genotypes P had been similar in such a way in children of the masculine sex, how much in children of the feminine sex, being that these samples had predominated in children less than 18 months. The positive samples for human rotavirus, as well as for genotypes G and genotype P had been found in every month of the years of had lasted the study. The east zone of the city of Manaus was where they had been found the biggest number of positive samples for rotavirus, as well as for genotype G and genotype P. The children with positive samples for rotavirus had presented on average of 10 episodes of diarrhea for child per day with predominance for the feces of liquid aspect (86.2%), this profile also was observed in the children with positive samples for genotypes G and genotypes P. With exception of the hyperthermia, other signals and characteristic symptoms of the diarrheic disease for rotavirus as vomit, dehydration and abdominal pain, had been presents in the biggest parcel of the children with positive samples in such a way for human rotavirus as for genotype G, as for genotype P. The high number of samples that had not been tipadas with use of specific primers for genotypes G and P, suggest the circulation of uncommon genotypes in the region, however so that this situation is defined, new studies of the epidemiological molecular of rotavirus circulating in Manaus, Amazon, must be developed, enclosed specific primers also for detention of rotavirus of animal origin.