3. Ascaris lumbricoides Dr Kamran Afzal Classified Microbiologist

5. Prevalence of Helminths

13. A pair of female and male worms Notice the vulvar waist (arrow) of the female worm and the coiled end of the male worm

15. Life Cycle

25. Emergence of adult worms A large mass of Ascaris lumbricoides that was passed from the intestinal tract

26. Intestinal blockage in heavy infections - intestinal obstruction Worms may knot up causing blockage which may be fatal

27. CS of a liver specimen contains many adult worms of A.lumbricoides obstructing the intrahepatic and extrahepatic bile ducts A.lumbricoides in common bile duct

28. An autopsy specimen shows intestinal obstruction by many adult worms of A.lumbricoides Markedly distended intestinal loop and worms protruding from the perforated wound

29. Peritonitis caused by intestinal perforation due to Ascaris Resected bowel and the adult female from the peritoneal cavity

30. Penetrate to the pancreas and the appendix

31. Ascarid chronic pancreatitis

32. Larva in section of lung Ascaris Pneumonitis Asthma

40. How many people in the world are estimated to be infected with A. lumbricoides ?

41. Who are the definitive host/s of this parasite?

42. Name 2 modes of transmission?

43. What morphological difference can be seen in fertile and infertile eggs?

44. Name the symptoms caused by larvae migration in the lungs

45. What is the drug of choice for this parasite?

46. What are some of the methods of prevention?