Association of interleukin 10 and interferon gamma gene polymorphisms with enterovirus 71 encephalitis in patients with hand, foot and mouth disease

Abstract Enterovirus 71 (EV71) is one of the common causative agents of hand, foot and mouth disease (HFMD), and is associated with several outbreaks with neurological complications including encephalitis. This study investigated the polymorphisms of interferon gamma (IFN-γ)+874 T/A and interleukin 10 (IL-10)−1082 G/A in 65 Chinese patients with EV71 encephalitis and 113 Chinese HFMD patients without complications. The polymorphisms of IFN-γ+874 T/A and IL-10−1082 G/A were determined by polymerase chain reaction (PCR)–amplification refractory mutation system (ARMS) and PCR–sequence-specific primer (SSP) analysis, respectively. The IFN-γ + 874 A allele was observed with significantly greater frequency in patients with EV71 encephalitis (76.2%) compared with HFMD patients without complications (61.1%, p < 0.01). Similarly, the IL-10 − 1082 A allele was observed with significantly greater frequency in patients with EV71 encephalitis (86.2%) compared with HFMD patients without complications (77.0%, p < 0.05). IFN-γ + 874 A and IL-10 − 1082 A alleles are associated with susceptibility to EV71 encephalitis in Chinese patients.

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