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Discussion

An infectious disease is ___________ .

  • A.caused only by bacteria
  • B.spread from person to person
  • C.spread from animal to animal
  • D.caused only by viruses

Answer: B

Correct answer: spread from person to person

An infectious (communicable) disease is one that can be transmitted, whether by air, water, contact or a vector. The cause may be a bacterium, a virus, a fungus or a protozoan - it is the transmissibility, not the kind of organism, that defines it.

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