Which statement about animals that shed potential pathogens is true?

Which statement about animals that shed potential pathogens is true?

• A. They often appear healthy
• B. They never shed pathogens
• C. They always show obvious symptoms
• D. All animals shed pathogens at all times

Answer: (A)

Many animals can carry and shed pathogens even when they look perfectly healthy. This happens because infections can be subclinical or animals can be asymptomatic carriers, releasing pathogens in saliva, feces, urine, milk, or on the skin without showing illness. Shedding often fluctuates—it's not constant and can be influenced by stress, age, or immune status—so the absence of symptoms is not a reliable indicator of safe or pathogen-free status. This is why public health approaches emphasize not just clinical signs but actual testing and environmental monitoring, along with good hygiene and biosafety practices, to assess and manage zoonotic risk.

Many animals can carry and shed pathogens even when they look perfectly healthy. This happens because infections can be subclinical or animals can be asymptomatic carriers, releasing pathogens in saliva, feces, urine, milk, or on the skin without showing illness. Shedding often fluctuates—it's not constant and can be influenced by stress, age, or immune status—so the absence of symptoms is not a reliable indicator of safe or pathogen-free status. This is why public health approaches emphasize not just clinical signs but actual testing and environmental monitoring, along with good hygiene and biosafety practices, to assess and manage zoonotic risk.