I receive acupuncture treatment every week.

He needs long-term drug therapy.

That information is unnecessary.

That information is completely unnecessary.

He thinks that war is a necessary evil.

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

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

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.