All types of genetic diseases occur at birth. You cannot catch the disease from someone else who has the disease. You are either born with the genetic disease in your DNA or not. So the disease can be inherited from your parents through the DNA, but cannot be caught later in life. No person with a genetic disease is contagious or infectious or able to transmit the disease to another person.
Contagion and contagiousness refers to how easily the spread of Genetic Disease is possible from one person to another. Other words for contagion include "infection", "infectiousness", "transmission" or "transmissability". Contagiousness has nothing to do with genetics or inheriting diseases from parents. For an overview of contagion, see Introduction to Contagion.
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