Molecular diagnosis of human enteroviruses by phylogeny-based classification by use of the VP4 sequence

The Journal of Infectious Diseases
Hiroaki IshikoNaokazu Takeda

Abstract

Human enteroviruses (EVs) are the major cause of a variety of acute and chronic illnesses. Virus isolation and neutralization tests are usually done to identify the causative virus, but these tests are labor intensive, time consuming, and sometimes require suckling mice from which certain viruses have been isolated. This study investigated a rapid and reliable method based on reverse-transcription polymerase chain reaction and phylogenetic analysis. The phylogenetic tree constructed by neighbor-joining on the basis of the VP4 sequence from 66 prototypes grouped all human EVs into 5 distinct clusters. These clusters correspond closely to the 5 newly designated species-human EV A-D and poliovirus. The VP4 sequences of 89 isolates from 26 serotypes obtained over >30 years plus those of 66 prototype strains were analyzed. Each isolate formed a monophyletic cluster along with its respective prototype strain, allowing for serotype identification (with the exception of E-8). VP4-based classification appears to be an effective tool for the molecular epidemiology study of EVs.

Citations

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