A study on symbiosis between humanity and infectious diseases

本研究着眼于病毒作为病原体的适应过程和人类作为宿主的适应过程。近年来，由于全球人口的增长、城市化、热带雨林的丧失和生态系统的破坏，新型病毒进入人类社会的机会增加了。然而，从生态学的角度来看，病毒感染随着人类社会的变迁而出现和消失。我们用流行病学模拟的方法研究了这种情况。因此，我们可以得出一个假设，即人类应该与病毒共存，并将它们的毒性定为低毒力。但另一方面，我们意识到，对于我们人类来说，解决这个问题似乎是一个挑战。

This study focuses on adaptation process of virus as a pathogen and humanity as a host. The opportunity for a new virus to emerge into a human society, recently, increases because of the growth of global population, urbanization, the loss of rain forest and destruction of ecosystem resulted by them. However, from ecological view point, the virus infections have appeared and disappeared as a human society changes over time. We examined such a situation by using epidemiological simulation. As a result, we could obtain a hypothesis that humanity should co-live with viruses, timing them as to be a low virulent one. But in the other hand, we realized that there seems a challenge ahead for us human to address this issue.