Virus biomass outweighs human biomass, and insects biomass outweighs human biomass. Insects are regularly habited by viruses as well as humans, humans are further inhabited via insects. A model of viral flow is described and specified to explain influenza virus seasonality, which, in temperate climate, usually evolves when insects have mostly disappeared. With this hypothesis a coherent description of regular seasonal influenza and other seasonal respiratory virus infections in temperate climates is possible. The incidence of influenza under different circumstances e.g. temperature, humidity, or tropical conditions and different aspects like synchronicity of infections or in respect to evolutionary conditions do sustain this hypothesis if the behaviour of insects is considered.

中文翻译：

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流感病毒从昆虫传播到人类是流感季节性的原因

病毒生物量超过人类生物量，昆虫生物量超过人类生物量。昆虫经常被病毒和人类居住，人类通过昆虫进一步居住。描述并指定了病毒流动模型来解释流感病毒的季节性，在温带气候下，通常在昆虫大部分消失时进化。有了这个假设，就可以连贯地描述温带气候下的常规季节性流感和其他季节性呼吸道病毒感染。如果考虑昆虫的行为，流感在不同情况下的发病率，例如温度、湿度或热带条件以及感染的同步性或进化条件等不同方面确实支持这一假设。