I work at a travel agency.

That traveller is travelling around the world.

The passenger pigeon is an extinct species that was once very common in North America.

My dream is to time travel.

The infectious capacity of this virus is very strong.

The number of people infected with the new coronavirus is rapidly increasing.

A ping-pong infection occurred at school, causing many students to take time off.

Oral infection is when pathogens enter the body through food or drink.

Prevention of infectious diseases is important with hand washing and wearing masks.

Due to the increase in community-acquired infections, please thoroughly wash your hands and wear masks.