Inactivation of the novel avian influenza A (H7N9) virus under physical conditions or chemical agents treatment

Virology Journal

Yuelong Shu²  Kun Qin¹  Hong Bo¹  Jie Dong¹  Ye Zhang¹  Jianfang Zhou¹  Libo Dong¹  Rongbao Gao¹  Junfeng Guo¹  Shumei Zou¹ 

[1] Key Laboratory for Medical Virology, National Health and Family Planning Commission, 155 Changbai Road, Beijing 102206, P.R China;National Institute for Viral Disease Control and Prevention, China CDC, Key Laboratory for Medical Virology, National Health and Family Planning Commission, 155 Changbai Road, Beijing 102206, P.R China

关键词: Disinfectants;    pH;    Ultraviolet light;    Temperatures;    Inactivation;    H7N9 virus;   

Others  :  821420
DOI  :  10.1186/1743-422X-10-289

 received in 2013-06-24, accepted in 2013-09-02,  发布年份 2013

【 摘 要 】

Background

In the spring of 2013, a novel avian-origin influenza A (H7N9) virus in Eastern China emerged causing human infections. Concerns that a new influenza pandemic could occur were raised. The potential effect of chemical agents and physical conditions on inactivation of the novel avian influenza H7N9 virus had not been assessed.

Methods

To determine the inactivation effectiveness of the novel avian influenza A (H7N9) virus under various physical conditions and chemical treatments, two H7N9 viruses A/Anhui/1/2013 and A/Shanghai/1/2013 were treated by varied temperatures, ultraviolet light, varied pHs and different disinfectants. The viruses with10^7.7 EID₅₀ were exposed to physical conditions (temperature, ultraviolet light and pH) or treated with commercial chemical agents (Sodium Hypochlorite, Virkon®-S, and Ethanol) respectively. After these treatments, the viruses were inoculated in SPF embryonated chicken eggs, the allantoic fluid was collected after 72–96 hours culture at 35°C and tested by haemagglutination assay.

Results

Both of the tested viruses could tolerate conditions under 56°C for 15 minutes or 60°C for 5 minutes, but their infectivity was completely lost under 56°C for 30 minutes, 65°C for 10 minutes, 70°C, 75°C and 100°C for 1 minute. It was also observed that the H7N9 viruses lost their infectivity totally after exposure of ultraviolet light irradiation for 30 minutes or longer time. Additionally, the viruses were completely inactivated at pH less than 2 for 0.5 hour or pH 3 for 24 hours, however, viruses remained infectious under pH treatment of 4–12 for 24 hours. The viruses were totally disinfected when treated with Sodium Hypochlorite, Virkon®-S and Ethanol at recommended concentrations after only 5 minutes.

Conclusions

The novel avian influenza A (H7N9) virus can be inactivated under some physical conditions or with chemical treatments, but they present high tolerance to moderately acidic or higher alkali conditions. The results provided the essential information for public health intervention of novel H7N9 avian influenza outbreak.

【 授权许可】

   
2013 Zou et al.; licensee BioMed Central Ltd.

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