Some viruses, such as human herpesvirus 1, infect a cell without causing symptoms; these are called:

• A. Latent viruses.
• B. Phages.
• C. Lytic viruses.
• D. Slow viruses.

Answer: (A)

Verified step by step guidance

1. Understand the definitions of each type of virus mentioned in the options.
2. Latent viruses are those that can remain dormant within a host cell and do not immediately cause symptoms. They can reactivate later, causing symptoms.
3. Phages, or bacteriophages, are viruses that infect bacteria, not human cells.
4. Lytic viruses are those that cause the destruction of the host cell by lysis, leading to symptoms.
5. Slow viruses cause disease after a long incubation period, but they do not remain dormant like latent viruses.