Summary
Biological and biochemical characters of seven enterovirus 71 (E71) isolates were compared. Four isolates (two from patients with hand, foot and mouth disease [HFMD] and two from patients with encephalitis) grew in cynomolgus monkey kidney cells both at 39.5 and 35° C. However, the remaining three strains (from patients with HFMD) grew at 35° C, but not at 39.5° C. Three temperature-resistant and two temperature-sensitive strains were tested for neurovirulence in monkeys. Temperature-resistant strains were shown to be neurovirulent, whereas temperature-sensitive strains were less neurovirulent. The results suggest correlation between temperature-sensitive growth and neurovirulence in monkeys of E71. Variation in the electrophoretic mobility of the viral polypeptides was detected in three out of seven strains. The fingerprinting of oligonucleotides generated from the viral genome showed similar patterns in two isolates from patients with HFMD and one from patient with encephalitis and variable patterns in each genomic map of remaining four strains. These variations of polypeptide patterns and of oligonucleotide maps could not be correlated with pathogenicity (encephalitis or HFMD), temperature-sensitive growth and neurovirulence in monkeys.
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Hagiwara, A., Yoneyama, T., Takami, S. et al. Genetic and phenotypic characteristics of enterovirus 71 isolates from patients with encephalitis and with hand, foot and mouth disease. Archives of Virology 79, 273–283 (1984). https://doi.org/10.1007/BF01310816
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DOI: https://doi.org/10.1007/BF01310816