Molecular typing of enteroviruses from healthy children in the border areas of Yunnan Province and Myanmar and the genetic characteristics of ECHO7 and ECHO13 in 2009 / 病毒学报

ABSTRACT

To explore the enteroviruses surveillance among healthy children under 15 years old in the border areas of Yunnan Province and Myanmar in 2009. The stool samples were collected from the healthy children under 15 years old who came from the border areas of Myanmar and Yunnan Province, virus isolation and sequencing were conducted for all the 271 samples. 6 strains of polioviruses (PVs) were detected from 271 stools with an isolation rate of 2.8%, which belonged to vaccine strains and 24 non-polioviruses (NPVs) were detected with an isolation rate of 8.9%. 24 NPVs belonged to human enterovirus group B (HEV-B) with 6 serotypes, HEV-A, HEV-C and HEV-D viruses were not isolated. Among them, 13 NPVs were E7 (54.17%) and 5 NPVs were E13 (20.83%). Our results showed that the enterovirus carrying rate in the border areas of Yunnan province was higher than the rate of routine acute flaccid paralysis (AFP) detection system. The HEV-B viruses were the only enteroviruses isolated. The phylogenetical analysis showed that Echovirus 7(E7) and 13 (E13) exhibited genetic polymorphism.