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B
Bacterium
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C
Helminth
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D
Protozoan
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Solution
The correct option is A Virus
Smallpox is an acute, contagious disease unique to humans, caused by either of two virus variants, Variola major and Variola minor.
Symptoms include high fever, chills, headache, severe back pain, abdominal pain, vomiting. These symptoms would go away within two to three days.
Then the patient would feel better. However, just as the patient started to feel better, a rash would appear. The rash started on the face and then spread to the hands, forearms, and the main part of the body.