The Following Questions Are Based on the Description Below

question 56

Multiple Choice

The following questions are based on the description below.
Rose-picker's disease is caused by the yeast, Sporothrix schenkii. The yeast grows on the exteriors of rose-bush thorns. If a human gets pricked by such a thorn, the yeasts can be introduced under the skin. The yeasts then assume a hyphal morphology and grow along the interiors of lymphatic vessels until they reach a lymph node. This often results in the accumulation of pus in the lymph node, which subsequently ulcerates through the skin surface, and drains.
-Humans have immune systems in which lymph nodes are important, because many phagocytes and lymphocytes reside therein. Given that a successful infection by S. schenkii damages lymph nodes themselves, which of these is most probable?

• A)The hyphae secrete antibiotics, which increases the ability of the infected human to tolerate the fungus.
• B)Their conversion from yeast to hyphal morphology allows such fast growth that the body's defenses are at least temporarily overwhelmed.
• C)Defensive cells of humans cannot detect foreign cells that are covered with cell walls composed of cellulose.
• D)Given that most fungal pathogens attack plants, human defenses are simply not adapted to seek out and destroy fungi.
• E)Given that most fungal pathogens of humans infect only the skin, human defenses are not adapted to seek out and destroy systemic fungal infections.

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