Multiple choice

Which of the following is a doughnut shaped virus?

  1. Calicivirus

  2. Cytomegalovirus

  3. Torovirus

  4. Astrovirus

  5. Norwalk virus
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

These viruses are pathogens for both humans and animals. They are pleiomorphic, coated, single positive strand RNA viruses. In the electron microscope, they have a doughnut shape.

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