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.

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

Please refrain from going out because community-acquired infections are spreading rapidly.

It is important to identify the source of infection.

The infectious capacity of this virus is very strong.

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

He contracted severe invasive streptococcal disease and underwent emergency surgery.

A cranefly has come in through the window and is flying around the room.

His younger brother has mutism and doesn't speak a word in front of people.