Which of the following viruses has caused thousands of deaths globally as an 'emergent' virus?
Correct answer: B. SARS-CoV-2
- A. MERS
- B. SARS-CoV-2
- C. OC43
- D. HKUt
Explanation
SARS-CoV-2 is an emergent coronavirus that caused the COVID-19 pandemic and millions of deaths worldwide. Students may choose MERS because it is also an emergent coronavirus, but its global death toll and spread were far lower than those of SARS-CoV-2.
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About Viruses
Viruses are acellular infectious particles made of genetic material enclosed by a protein capsid, sometimes with a lipid envelope. Their replication depends on a host cell and may follow lytic or lysogenic cycles, so viral structure and reproduction differ fundamentally from those of cellular organisms such as bacteria.
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