Infectious disease in livestock is defined as what?

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Multiple Choice

Infectious disease in livestock is defined as what?

Explanation:
Infectious disease in livestock is defined by disease caused by a pathogen that can spread between animals. The pathogen—bacteria, viruses, fungi, or parasites—drives the illness, and transmission from one animal to another is a hallmark of infectious disease, making it contagious in practical terms. The other descriptions describe conditions not caused by a transmissible biological agent: genetic diseases are inherited and not spread, diseases driven mainly by environment are not caused by pathogens, and inflammatory status alone doesn’t define an infectious cause.

Infectious disease in livestock is defined by disease caused by a pathogen that can spread between animals. The pathogen—bacteria, viruses, fungi, or parasites—drives the illness, and transmission from one animal to another is a hallmark of infectious disease, making it contagious in practical terms. The other descriptions describe conditions not caused by a transmissible biological agent: genetic diseases are inherited and not spread, diseases driven mainly by environment are not caused by pathogens, and inflammatory status alone doesn’t define an infectious cause.

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