How do virulence and contagiousness differ, with an example from veterinary pathogens?

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Multiple Choice

How do virulence and contagiousness differ, with an example from veterinary pathogens?

Virulence and contagiousness describe two different aspects of a pathogen’s behavior. Virulence is about how severe the disease is once a host is infected—the damage, illness, or mortality caused by the pathogen. Contagiousness is about how easily the pathogen can move from one host to another—the ease of transmission in the environment or through contact. Canine parvovirus is a strong example: it is highly virulent because the infections in puppies can cause rapid, life-threatening damage to the intestinal lining and often require intensive care. It is also highly contagious, spreading quickly through contact with infected feces or contaminated environments. Bordetella bronchiseptica, on the other hand, is very contagious, especially in crowded settings like kennels, causing kennel cough, but its virulence is more variable—some infections are mild, while others can be more severe depending on the host and circumstances. This shows the distinction clearly: one term describes how bad the disease is, the other describes how easily it spreads. The other choices mix up the concepts or state something incorrect about parvovirus being non-contagious, which it is not.

Virulence and contagiousness describe two different aspects of a pathogen’s behavior. Virulence is about how severe the disease is once a host is infected—the damage, illness, or mortality caused by the pathogen. Contagiousness is about how easily the pathogen can move from one host to another—the ease of transmission in the environment or through contact.

Canine parvovirus is a strong example: it is highly virulent because the infections in puppies can cause rapid, life-threatening damage to the intestinal lining and often require intensive care. It is also highly contagious, spreading quickly through contact with infected feces or contaminated environments. Bordetella bronchiseptica, on the other hand, is very contagious, especially in crowded settings like kennels, causing kennel cough, but its virulence is more variable—some infections are mild, while others can be more severe depending on the host and circumstances. This shows the distinction clearly: one term describes how bad the disease is, the other describes how easily it spreads.

The other choices mix up the concepts or state something incorrect about parvovirus being non-contagious, which it is not.

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