Giun tròn nhỏ (5-10 mm dài) sống ở đại tràng. Trứng gửi trên da quanh hậu môn Thông thường triệu chứng ban đêm tại chính IS hậu môn ngứa gãi mạnh gây ô nhiễm các ngón tay cho phép truyền tải để liên lạc và autoinfection. Truyền trong fomites IS chung cư bị ô nhiễm của sâu vào âm đạo và niệu đạo và viêm âm đạo | Chapter 29 Parasitic Infections 479 Pinworms Enterobius vermicularis Essentials of Diagnosis Small nematode 5-10 mm long lives in the colon. Eggs deposited on the perianal skin usually at night Major symptom is intense anal pruritis Scratching contaminates the fingers allowing transmission to contacts and autoinfection. Transmission in contaminated fomites is common Migration of worms to vagina and urethra may cause vaginitis and urinary tract infection Worms can be seen on the perianal skin while the child is sleeping Eggs may be obtained for microscopic identification on a piece of transparent tape pressed to the child s anus in the morning Differential Diagnosis Pruritus ani Perianal streptococcus infection Nonspecific vaginitis Urinary tract infection Treatment Launder bedsheets and night clothes frequently Keep hands and nails clean. Prevent scratching by wearing underwear to bed Check and treat all affected family members at the same time Pyrantel pamoate single does 11 mg kg is effective. Single-dose mebendazole and albendazole also effective Reinfection at school from untreated classmates is common Pearl Parents freak out over this common harmless infection. My old parasitology professor Dr Harold Brown always advised parents that pinworms are found even in the seats of the mighty meaning that even the cleanest child from the most immaculate home gets pinworms. 29 480 Current Essentials Pediatrics Ascariasis Ascaris lumbricoides Essentials of Diagnosis Fecal-oral spread of ova from human to human Swallowed ova hatch in intestine. Larvae penetrate intestine enter venous system travel to lungs are coughed up and swallowed. Larvae mature in the intestine Many infestations are asymptomatic. Severe infestations cause pain weight loss anorexia diarrhea vomiting and rarely intestinal perforation or obstruction of small bowel bile ducts or appendix Larvae migrating through the lungs may cause eosinophilic pneumonia Loffler syndrome Ova can be seen by microscopic .
