Infest (verb)

1. To be present in large numbers and causing trouble or damage.
2. To invade and take over a place or organism.

Origin:

Infest comes from the latin word infestare meaning "to attack" or "to annoy".

Examples:

1. The house was infested with termites and needed to be treated.
2. The city was infested with rats, making it difficult to walk at night.
3. The ship was infested with cockroaches, making it unsanitary.
4. The forest was infested with invasive species of plants.
5. The computer was infested with malware and needed to be cleaned.