HIV, which only infects humans, is considered to have a host range, whereas rabies virus, which can infect a number of animals and humans, is considered to have a host range.

narrow, broad

Explanation:

Host range in epidemiology refers to the number of potential host species a pathogenic organism is capable of infecting provided all other conditions are met. A pathogen with several potential host is said to have a wide host range while the one with very few potential host is said to have a narrow host range.

Hence, HIV in this case is considered to have a narrow host range while rabies virus is considered to have a wide host range.