He became infected with a cold.

This virus is highly infectious.

My computer was infected with a virus.

What we should aim for is a society with zero COVID.

In the with-corona era, a new lifestyle is necessary.

He solved a large number of problems.

Understanding numbers is important for solving math problems.

He was bedridden with illness for several days.

I can't solve this problem because there are too many numbers.

Hand washing and wearing masks are important for the prevention of severe acute respiratory syndrome.