65062
Pool feeders such as the sand fly and black fly , vectors for pathogens causing leishmaniasis and onchocerciasis respectively , will chew a well in the host 's skin , forming a small pool of blood from which they feed .
 sand fly, black fly, leishmaniasis, onchocerciasis
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: media, plant, vehicle, astronomical object, time, disease, animal, location, person, organization, mythical figure, food, biology, geographical phenomenon, instrument, event 
Text: {0} 
Answer:
 sand fly, black fly, leishmaniasis, onchocerciasis