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

Answer: Option 3

The one word substitution is Contagious. Incurable : (of a sick person or a disease) not able to be cured. Infectious : (of a disease or disease-causing organism) liable to be transmitted to people, organisms, etc. through the environment. Fatal : leading to failure or disaster. Contagious : (of a disease) spread from one person or organism to another, typically by direct contact.

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