1. phylum:Nemathelminthes class:Nematoda order:Ascaridoidea
Ascaris lumbricoides

2. Ascaris lumbricoides Disease : Ascariasis (round worm infection)
Reproduction: dieceious sexual.(sexes are separated)
Diagnostic stages: egg (fertilized, unfertilized), adult worm.
Usual habitat: small intestine.
Life cycle: simple (occures in single host).
Definitive host: Man
Infective stage: embryonated egg containing the larva Route of infection: ingestion of food or water contaminated with the embryonated eggs (that contain laryae)
Diagnostic test : detection off eggs by microscopic stool examination.

4. Ascaris lumbricoides adult worm
The female 22 – 35 cm, the male 10 – 31 cm this worms like earth worm
Male and female anterior end, with three lips
Ascaris lumbricoides adult worm
Note: white, brown redish or light brown or pink . The posterior end of the male, curved with 2 spicules, the female with straight end

10. Ascaris lumbricoides: -Unfertilized Egg stool smear
In Iodine s.
In Saline s.
Elongated oval, no semilunar space with irrregular albuminous layer 88 – 94 X 40 – 50 µm
Ascaris lumbricoides: -Unfertilized Egg stool smear

11. Ascaris lumbricoides: -Fertilized Egg In Saline s.

12. Its fertile ovum, but the outer coat is sometime lost
Fertile, with
Fertile, with larva
one-cell stage
Iodine Stain.
Semilunar space
Vitelline layer (1st)
One cell stage
Decorticated egg
Its fertile ovum, but the outer coat is sometime lost
2nd layer (thick)
3rd layer outer coarse albuminous layer (regular)
Ascaris lumbricoides: Fertilized Egg In Iodine s. stool smear ( golden brown in colour ) 60 – 75 X 40 – 50 µm, is spherical or oval with semilunar space and regular albuminous layer

13. Ascaris lumbricoides egg hatching

14. Ascaris lumbricoides Larva in Lung Section
Note : the larva also detected in sputum
Hematoxylim - eosin s.

15. life cycle of Ascaris lumbricoides
280
Ascaris lumbricoides
life cycle of Ascaris lumbricoides

16. Ascaris lumbricoides in Intestine
Case of death because, of the No. of adult worms of Ascaris lumbricoides making blockage of lumen of intestine
Ascaris lumbricoides in Intestine

17. phylum:Nemathelminthes class:Nematoda order:Ascaridoidea
parascaris equorum

18. Female 50 c m
Male cm

19. Parascaris equorum

20. Toxocara Canis

21. Introduction Dog Round Worm - Phylum: Nematoda Zoonotic Disease
T. cati is the feline form

22. Infection Geographic Range: Worldwide Definitive Host: Dogs
Intermediate Host: None
Accidental Host: Humans and other mammals
Children more susceptible than adults

23. Infection Dogs Humans Found in Intestines Ingest Egg Transplacenta
Transmammary
Puppies Born Infected with T. cannis
Puppies less than 5 weeks
Humans
Can be found in liver, lung, brain, heart, muscle, or eye

24. Morphology
Adult Female
5 to 18 cm long
Adult Male
4 to 10 cm long

28. Life Cycle
Eggs must be present in external environment for 2 weeks to bi infective
Ingestion by dog
Eggs hatch and larvae penetrate the gut wall
Migrate into various tissues; encyst if dog older than 5 weeks
Younger dogs larvae migrate through lungs, bronchial tree, esophagus, and move back into the small intestine

29. Life Cycle Older Dogs Encysted Stages reactivate during pregnancy
Infection spread by transplacental and transmammary routes
Infective eggs spread through lactating bitches

30. Life Cycle Accidental Host Infected by ingestion of infective eggs
Eggs hatch and larvae penetrate the intestinal wall
Carried by Circulatory System to various tissues
Larvae don’t undergo further development but can cause reactions in tissue (toxocariasis)

32. Symptoms In dogs usually asymptomatic
Heavy infections can result in death
In Humans
Abdominal Pain
Decreased Appetite
Restlessness
Fever
Other symptoms vary with site larvae infection

33. Ocular Larvae Migrations (OLM)
Caused by larva migration to the retina
Inflammation
Scar formation
Retinal Detachment
Partial to Full Vision Loss
10,000 Infections per year
700 permanent vision loss

34. Visceral Larvae Migrations (VLM)
Caused by movement of worm larvae throughout various organs of the body
Dependent on organ infected
Fever
Coughing
Asthma
Pneumonia
Wheezing
Hepatosplenmegaly

35. Treatment
Use anti-parasitic drugs in combination with anti-inflammatory medications
Albendazole
Preferred Choice
Mebendazole
Thiabendazole
Ocular Larvae Migrations Require Surgery