Which of the following CANNOT be transmitted via infectious droplets?
Correct answer: D. None of the above
- A. Rubella
- B. Common cold
- C. Influenza
- D. None of the above
Explanation
Rubella, the common cold and influenza can all spread through infectious respiratory droplets, so none of the listed diseases is excluded. Students may choose influenza because they associate it mainly with airborne spread, but respiratory droplets are also an important route of influenza transmission.
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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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