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.

General relativity is a theory of physics proposed by Einstein.

Special relativity is one of the fundamental theories of physics.

This area is seriously contaminated with radioactive isotopes.

He feels dizzy when he stands up suddenly due to orthostatic hypotension.

My father was diagnosed with ankylosing spondylitis.