Which of the following pathogens has an infectious dose so low that a single infectious particle (cell, cyst, endospore, virus) can cause disease?

Name: Which of the following pathogens has an infectious dose so low that a single infectious particle (cell, cyst, endospore, virus) can cause disease?
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Question

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Norovirus is known for its extremely low infectious dose, where as few as 18 viral particles can cause infection, making it highly contagious and capable of causing disease with minimal exposure.

Which of the Following Pathogens Has an Infectious Dose So