Although investigation of the relationship between climate and infectious diseases is still at a preliminary stage, excessive human development of jungles and rainforests has increased people's chances of coming into contact with the microorganisms which live there, and with their natural hosts.
雖然氣候與與流行病的關係還在初步探究中，但人類往叢林、雨林過度開發，增加了人們與存在其中的微生物或其天然宿主接觸的機會，無形中促進了疾病散播的機會，卻是強烈的事實。