The other three categories will cover increasingly serious levels of infection.

Drawing since he was ten years old, painting became an increasingly serious aspect of his life.

It also said that "the damage to the human and natural environment caused by war is an increasingly serious problem."

A loss that will become increasingly serious over the next decade.

Tuberculosis is also an increasingly serious health concern in China.

But not only are they still dating, it appears the relationship is getting increasingly serious.

But they have kept at it for nearly 90 increasingly serious years.

But one of his best friends is in a relationship that has become increasingly serious.

Violent crime has been an increasingly serious issue in the region since the 1990s.

Before the organization goes forward, its leaders will have to confront several increasingly serious problems.