Parasitology
lab-10(ascaris+enterobius)
1-Ascaris lumbricoides : ( roundworm ---- nematode )
1- Largest nematode :::: 35cm
2- Adult females about 20 to 35 cm. long ….. Adult male about 15 to 30 cm. long
3- morphology ::: from the lecture
4- life cycle :: من محاضرة النظري ولكن الهام في العملي هي النقاط التالية
1- habitat :: small intestine (in duodenum)
2- diagnostic stage :: egg pass in stool (contain non mature embryo )
3- Infective stage :: egg in soil ( contain second stage larva )
4- route of infection :: oral route (( contaminated food-drink-hand-vegetables ))
5- why larva rapture the capillaries in the lung ??? the diameter of larva is 0.02 mm and
the diameter of capillaries is 0.01 so larva rapture the capillaries and go through the
bronchial tree to the pharynx and swallowed again.
6- it take 2 to 2.5 months from infection to adult stage under optimum conditions
7- symptoms : loss of appetite , fever , wheezing , vomiting , dyspnea , abdominal pain
, abdominal swelling , diarrhea .
8- very dangerous in children lead to intestinal obstruction
9- diagnosis :: 1- stool examination for egg (( round or oval ,, albumin layer in the wall
Hyaline layer in the wall ,, non-mature embryo,, corticated))
2- worm in the stool or vomit
3- larva in gastric or respiratory secretions
4- eosinophilia ( blood count )
10 – treatment :: mebensazol – albensazol
2-Enterobius vermicularis (threadworm - seat worm - pinworm Oxyuris vermicularis )
1- The adult female has a sharply pointed posterior end, is 8 to 13 millimeters long
2- The adult male is smaller, measuring 2 to 5 millimeters long , and it has a curved
posterior end (( we should differentiate between male and female ))
3- diagnostic characters of it ::::
the esophageal bulb in adult and D shape egg
4- the uterus in female is full with eggs
5- habitat :: cecum and adjacent parts of small and large intestine
6- it need air and low temperature so it go to the perianal region during night
7- when it reach the perianal region it take 4 to 6 hours to become infective (egg
containing larva )
8- group at risk :::: children
9- source of infection (( contaminated food , drink ,hand ………..))
10 – route of infection : -1- oral route -2- retro-infection -3- inhalation of the eggs
11- diagnosis :: 1- scotch test 90%
2- stool examination 5%
3- self-diagnosis
12- diagnostic stage :: egg (contain non mature embryo )
13 - Infective stage :: egg ( contain larva )
(( المطلوب في
)) الساليدات
1- Ascaris :::: ---
larva
in the lung
---
adult
( male and female ) in the specimen
---
egg
(( round or oval ,, albumin layer in the wall
Hyaline layer in the wall ,, contain larva,, corticated))
2- Enterobius ::: ---
adult female
(( larger – pointed posterior end – uterus full of egg -
esophageal bulb ))
---
adult male
(( smaller – curved posterior end -- esophageal bulb ))
---
egg
(( D-shape – contain larva – smooth surface – translucent
– thick outer shell ))