While you were having a conversation with a cattle veterinarian, she mentioned “animals latently infected with a virus” in a herd. The veterinarian was referring to:

Question

While you were having a conversation with a cattle veterinarian, she mentioned “animals latently infected with a virus” in a herd.  The veterinarian was referring to:

BlackTom AI · Accepted Answer

The question discusses the phrase 'animals latently infected with a virus' as used by a cattle veterinarian. Here, we are examining what latency means in the context of viral infections.
Option 1: 'Animals infected with a non-enveloped virus' describes a structural property of a virus, not the concept of latency. Latency is about the virus persisting in the host after initial infection, not about whether the virus is enveloped or not.
Option 2: 'Animals that carry a virus that may reactivate and cause disease' precisely captures the idea of latency: the virus remains dormant within the animal and can reactivate later to produce disease, sometimes without immediate clinical signs.
Option 3: 'Animals that have clinical mastitis, and therefore a reduction in milk production' describes an active disease state in the mammary gland, not latent infection. It does not reflect the persistence of a latent virus.
Option 4: 'Animals that carry a virus that may protect them against other pathogenic agents' implies cross-protection or immunity, which is not the core concept of latency. Latent viruses are not defined by providing protection against other pathogens.
Option 5: 'Animals that have been vaccinated with a latent virus vaccine' conflates vaccination with natural viral latency. A latent virus vaccine is a controlled vaccine scenario, not the biological definition of latent infection in a herd.
In summary, latency refers to a virus persisting in a host without causing active disease permanently, with potential for reactivation; thus option 2 accurately reflects that concept while the other options miss or mischaracterize latency.

AGRI20044_2025_SM1 Mid Semester Sample Questions - 2025

While you were having a conversation with a cattle veterinarian, she mentioned “animals latently infected with a virus” in a herd. The veterinarian was referring to:

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