A comparative study on biological characteristics of ten coxsackievirus A10 virus strains

In this study, we analyzed ten CVA10 strains were genotyped and cultured for 10 generations to detect plaque morphology, pathogenicity, growth and other characteristics. Mice were injected with live and inactivated virus to detect neutralizing antibody titers. The results suggested that all CVA10 strains fell into Genotype C. Each strain cultured on KMB₁₇ and Vero cells, increased from 1st generation onwards to peak in the 3rd and 4th, and the titer at which each became infectious ranged from 5.0 to 6.5 and 6.0 to 7.0 lgCCID₅₀/ml, respectively. Two-day-old BALB/c mice were selected and inoculated intracerebral with the CVA10 strains, Limb paralysis was significant as early as 3 d; paralysis of all limbs for 50% of affected mice. LT₅₀ was approximately 6 d, all died within 8 d. Ten strains induced good immune response, the GMT value of booster immunizations was higher than that of initial immunization. This provide reference points for selecting CVA10 vaccine candidates.