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Menstrual blood may be hazardous to the health of others, but only if the woman has a blood-borne disease and the blood in not properly handled.
If a disease is blood borne, it mean it exists or is caused by blood or blood cells.
OSHA -- Ocupational Safety and Health Administration and CDC -- Centers for Disease Control and Safety
Different blood borne diseases have different incubation periods.
Std, Aids , blood borne disease , infected cow.
dengue fever
At least seven. More likely, thousands.
Tick Born Disease [a blood test to detect Lyme Disease and other tick borne diseases]
heptaties
Ringworm infection is caused by a Tinea fungus. There is no vaccination because it a skin disease, not a blood-borne disease.
The most common human disease in southern Texas is heart disease. Diabetes is also a common disease in this area. Mosquito-borne diseases are becoming more prevalent in this area.
If the blood carries no blood-borne diseases, nothing would happen. However, if the blood is carrying a disease, depending on the disease, you MIGHT end up with that disease yourself - though that is uncommon as the stomach acid destroys most diseases. However, if you have a wound or ulcer between your mouth and your stomach, you are more likely to contract any blood-borne disease that may be in the blood.