According to Halstead (2001a), drinking fresh, uncooked blood causes the following signs and symptoms: diarrhoea, bloody stools, nausea, vomiting, hypersalivation, skin eruptions, cyanosis, apathy, irregular pulse, weakness, paraesthesias, paralysis, respiratory distress and possibly death.
Ocular contact is said to invoke a severe burning sensation and redness of the conjunctivae, lacrimation and swelling of the eyelids.