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Black piedra is considered infectious but is not transmitted from person to person.
Generally, a disease like this is caused by an infectious agent and not spread between people.
Black piedra, although infectious, is not a genetic disease. It is not caused by a defective or abnormal gene.
Transmission of Black piedra to a person can be by way of:
Contagion and contagiousness refers to how easily
the spread of Black piedra 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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