To understand how, we need to take a closer look at the role of insects. In many diseases an insect may be only one of several links in the chain of disease transmission.
कीड़ों से फैलनेवाली बीमारियों के लिए इंसानी समाज में आनेवाले बदलाव भी ज़िम्मेदार होते हैं ।