Objective To investigate the inactivating effect of heat and ultraviolet(UV) light on HCV JFH-1 strain using the cell culture system. Methods The HCV JFH-1 virus stock, with an initial titer of 2.5 × 104 FFU/ml, was exposed in 56℃ water bath or to UV light for varying durations of time for explo-ring their inactivating effects on the virus. The kinetics of virus titer reduction was determined by an indirect immuno-fluorescence assay (IFA). If the cells infected with the exposed virus stock were IFA negative after three blind passages, the virus stock was considered to be inactivated completely. Results After incubation of the HCV JFH-1 virus stock (2.5 × 104 FFU/ml)in 56℃ water bath for 10 min, 20 min and 30 min, the virus titers were reduced to 1.6 × 103 FFU/ml, 3.1 × 102 FFU/ml and 3.3 × 10 FFU/ml, respectively. The exposure of the virus stock to UV light (wavelength 253.7 nm, intensity ≥60 μW/cm2, 30 cm below the UV lamp) for 15 s, 30 s and 45 s resulted in virus fiter reduction to 1.0 × 103 FFU/ml, 1.1 × 102 FFU/ml and 2.7 × 10 FFU/ml, respectively. After 40 min incubation of the virus stock at 56℃, or 1 min exposure to UV light (wavelength 253.7 nm, intensity ≥60 μW/cm2) the virus infectious titer was reduced below the detection limit of IFA, and the IFA was still negative even after three blind passages, indicating that the virus was inactivated completely. Conclusion HCV is sensitive to heat and UV light treatment. For HCV JFH-1 virus stock containing 2.5 × 104 FFU/ml virus, heat treatment at 56℃ for 40 min, or UV light expo-sure at an intensity of ≥60 μW/cm2 for 1 min, resulting in complete virus inactivation.%目的 应用HCV JFH-1株细胞培养系统,研究热和紫外线照射对HCV的灭活效果.方法 感染性滴度为2.5×104 Ffu/ml的丙型肝炎病毒JFH-1株(HCV JFH-1 strain)原液,经56℃水浴或紫外线照射不同时间后,感染Huh7-25-CD81细胞系,应用间接免疫荧光法测定病毒感染性滴度的动态变化.若被感染的细胞经旨传3代后,用问接免疫荧光法检测为阴性,则判定病毒原液已被完全灭活.结果 感染性滴度为2.5×104 FFU/ml的HCV JFH-1株原液,经56℃水浴孵育10 min、20 min、30 min后,其细胞的感染性滴度分别降至1.6×103FFU/ml、3.1×102FFU/ml和3.3×10FFU/ml;该HCV JFH-1株原液暴露于紫外灯下(波长253.7 nm,辐照强度≥60 μW/cm2)30 cm处照射15 s、30 s、45 s后,其细胞的感染性滴度分别降至1.0×103FFU/ml、1.1×102FFU/ml和2.7×10FFU/ml.经56℃水浴孵育40 min或紫外灯下照射(波长253.7 nm,辐照强度≥60 μW/cm2)1 min后,应用间接免疫荧光法检测为阴性,被感染的细胞经盲传3代后,间接免疫荧光法检测仍为阴性,证明该病毒液已被完全灭活.结论 HCV JFH-1株对热和紫外线照射较为敏感,56℃下40 min或紫外线照射(波长253.7 nm,辐照强度≥60 μW/cm2,距离30 cm)1 min,可完全灭活HCV JFH-1株.
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