which of the following is true about infection
A. presentation of signs and symptoms are necessary for an infectious disease to happen
B. infections may happen when pathogens land on a site without specific receptor
C. presence of indigenous microbiota facilitates the colonization of pathogen
D. colonization of pathogen in which the host doesnt necessarily have to present with signs and symptoms
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why does being an obligate intracellular pathogen considered a virulent factor?
A. these pathogens are able to evade the cellular immune response and can be eliminated by the presence of humoral antibodies
B. these pathogens can reside practically both inside and outside of the cell whenever deemed necessary
C. these pathogens can quickly adapt to extracellular environment
D. these pathogens are able to evade the humoral antibodies and can be eliminated by a cellular immune response
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