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- All of the following are true of Legionnaires’ disease excepta) the causative organism can grow inside protozoa.b) it spreads readily from person to person.c) it is more likely to occur in long-term cigarette smokers than in nonsmokers.d) it is often associated with diarrhea or other intestinal symptoms.e) it can be contracted from household water supplies.What are the diseases of Sphaerotilus natans that can affect to either humans or animals?Comment on the qualitative and quantitative diagnosis of hookworm. Why is it important the quantitative diagnosis?