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Effects of Temperature Relative Humidity Absolute Humidity and Evaporation Potential on Survival of Airborne Gumboro Vaccine Virus

机译:温度相对湿度绝对湿度和蒸发潜能对机载Gumboro疫苗病毒存活率的影响

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摘要

Survival of airborne virus influences the extent of disease transmission via air. How environmental factors affect viral survival is not fully understood. We investigated the survival of a vaccine strain of Gumboro virus which was aerosolized at three temperatures (10°C, 20°C, and 30°C) and two relative humidities (RHs) (40% and 70%). The response of viral survival to four metrics (temperature, RH, absolute humidity [AH], and evaporation potential [EP]) was examined. The results show a biphasic viral survival at 10°C and 20°C, i.e., a rapid initial inactivation in a short period (2.3 min) during and after aerosolization, followed by a slow secondary inactivation during a 20-min period after aerosolization. The initial decays of aerosolized virus at 10°C (1.68 to 3.03 ln % min−1) and 20°C (3.05 to 3.62 ln % min−1) were significantly lower than those at 30°C (5.67 to 5.96 ln % min−1). The secondary decays at 10°C (0.03 to 0.09 ln % min−1) tended to be higher than those at 20°C (−0.01 to 0.01 ln % min−1). The initial viral survival responded to temperature and RH and potentially to EP; the secondary viral survival responded to temperature and potentially to RH. In both phases, survival of the virus was not significantly affected by AH. These findings suggest that long-distance transmission of airborne virus is more likely to occur at 20°C than at 10°C or 30°C and that current Gumboro vaccination by wet aerosolization in poultry industry is not very effective due to the fast initial decay.
机译:空气传播病毒的存活会影响空气传播疾病的程度。环境因素如何影响病毒生存尚不完全清楚。我们研究了在三个温度(10°C,20°C和30°C)和两个相对湿度(RHs)(40%和70%)下雾化的Gumboro病毒疫苗株的存活情况。检查了病毒存活对四个指标(温度,RH,绝对湿度[AH]和蒸发势[EP])的响应。结果显示了在10°C和20°C时的两相病毒存活,即在气雾化期间和之后的短时间内(2.3分钟)快速初始失活,然后在气雾化之后20分钟的时间内缓慢的次级失活。雾化病毒在10°C(1.68至3.03 ln%min -1 )和20°C(3.05至3.62 ln%min -1 )时的初始衰减显着低于30°C时的温度(5.67至5.96 ln%min -1 )。 10°C(0.03至0.09 ln%min -1 )的二次衰减往往高于20°C(-0.01至0.01 ln%min -1 的二次衰减>)。病毒的初始存活对温度和相对湿度以及对EP都有反应。次生病毒存活率对温度和相对湿度有反应。在这两个阶段,AH均未显着影响病毒的存活。这些发现表明,在20°C时比在10°C或30°C时,更容易发生空气传播病毒的远距离传播,并且由于初始的快速衰变,目前在家禽业中通过湿法雾化进行的Gumboro疫苗接种效果不佳。 。

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