He is an expert in serology, working on research into infectious diseases.

Gender roles are an important element in defining individual behavior in society.

His role is to fulfill his responsibilities as a leader.

The effect of this medicine is to alleviate the symptoms of a cold.

I am planning to have a physical examination next week.

It is important to understand the importance of health.

Please use the emergency stairs in case of a fire.

Due to the earthquake, the city declared a state of emergency.

Hand washing and wearing masks are important for the prevention of COVID-19.

Zoonosis is a disease that spreads from animals to humans, or vice versa.