Multiple choice

The doughnut shaped virus is

  1. cytomegalovirus

  2. calicivirus

  3. astrovirus

  4. norwalk virus

  5. torovirus
Reveal answer Fill a bubble to check yourself
E Correct answer
Explanation

These virus 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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