My cat has been infected with the feline immunodeficiency virus.

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.

It is important to learn about the prevention and treatment of the human immunodeficiency virus.

The human immunodeficiency virus destroys the immune system, making the body unable to fight disease.

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

Please calculate the quartiles of this data set.

Since he is still a green hand, he may make many mistakes.

The number of visitors to the park today is higher than yesterday.

He claims to be a true democrat at heart.