He likes to take a walk in the park at dusk.

The human immunodeficiency virus destroys the immune system, causing the body to lose its ability to fight disease.

The human immunodeficiency virus is the virus that causes AIDS.

The feline immunodeficiency virus can potentially have serious effects on a cat's health.

My cat has been infected with the feline immunodeficiency virus.

We should always remember the power of Kannon in difficult times.

The prevention of venereal diseases is most important in safe sexual behavior.

He got hypothermia from long exposure.

He was diagnosed with schizophrenia.

He is receiving treatment for acromegaly.