Ключевые слова: allergy, alternative, anesthesia, animal, animal experiment, annelid, background, biology, blood, bloodsucker, bloodsucking, collagenase, detail, detoxification, fringe, health, health care, healthy, hematophagy, hermaphrodite, hirudinea, hirudo, hirudo medicinalis, hiv, hospital, hyaluronidase, hypertension, illness, invertebrate, leech, leeches, macro, medical, medicinal, medicine, microbiology, nature, parasite, parasitic, peptidase, research, science, sucker, tentacle, therapy, treatment, vasodilator, wet, white background, worm,