Is Viral diseases Contagious?
Transmission of Viral diseases from Person to Person
Viral diseases has subtypes that are considered contagious and also has subtypes that are not contagious.
Generally the disease can be transmitted by saliva, air, cough, fecal-oral route, surfaces, blood, needles,
blood transfusions, sexual contact, mother to fetus, etc., but not ALL subtypes.
Viral diseases, although infectious, is not a genetic disease. It is not caused by a defective or abnormal gene.
About contagion and contagiousness:
Contagion and contagiousness refers to how easily
the spread of Viral diseases 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.