Ключевые слова: aid, animal, annelid, background, biology, blood, bloodsucker, bloodsucking, closeup, detail, extreme, healthcare, hirudo, hospital, humans, illness, isolated, leech, leg, macro, man, medicinal, medicinalis, medicine, microbiology, nature, organ, parasite, parasitic, pest, research, science, skin, stained, sucker, sucking, treatment, veins, wet, white, worm,