1. Infectious
  2. Contiguous
  3. Fatal
  4. Contagious
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1 Answers

Answer: Option 4

One word substitute is Contagious. Infectious: (of a disease or disease-causing organism) liable to be transmitted to people, organisms, etc. through the environment. Contiguous: sharing a common border; touching. Fatal: causing death. Contagious: (of a disease) spread from one person or organism to another, typically by direct contact.

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