An epidemiologist studies how disease spreads within certain groups of people or populations.
Epidemiologists search for the cause of disease, identify people who are at risk, determine how to control or stop the spread or prevent it from happening again.
Epidemiologists collect and analyze data to investigate health issues. for example epidemiologist might study demographic data to determine groups at high risk for a particular disease. five major tasks of epidemiology in public health practice are public health surveillance, field investigation. Epidemiology is considered as complex science as it needs to consider multiple variables associated with human diseases like pathogens, social dynamics and climate factor .
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