वह व्यक्ति, जानवर, वस्तु या पदार्थ जिससे कोई संक्रामक एजेंट होस्ट (परपोषी) में स्थानांतरित या प्रसारित होता है, कहलाता है:

The epidemiological triad consists of which three components?

The time period from infection/disease initiation until the infected individual becomes infectious or detectable by diagnostic testing is termed the:

Case fatality rate in epidemiology is defined as the proportion of deaths among diagnosed cases of a particular disease during a specific period, indicating: