الديدان الاسطوانية Round Worm (الاسكارس Ascaris lumbricoides)

Ascaris lumbricoides
✧الاسم الشائع لها
الديدان الاسطوانية Round Worm
•Phylum: Nematode
•Class: Secernentea
•Family: Ascarididae
•Genus:Ascaris
●Ascaris lumbricoides
كلمة Ascaris تعني Askaris ومعناه ديدان الامعاء ،
وكلمة Lumbricus تعني مشابهة لدودة الارض Earthworm
◎مواصفات البويضة
✸MORPHOLOGICAL CHARACTERISTICS:
━ Fertile Ascaris:
– Size 55-75 x 35-50 μm
– Spherical/Subspherical shape
━ Infertile Ascaris:
– Size 85-95 x 43-47 μm
– Long, oval shape
· Mamillated shell may exist (corticated) or not (decorticated)
· Yellowish brownish-grey colour
✿OBSERVATIONS:
Morphological characteristics of this specie are identical to the Ascaris in pig, A. suum.
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@LabMed201
💮طريقة انتقال الاسكارس
💮Mode of infection
¤ Ingestion of Embryonated egg through contaminated food or water
¤ The source of transmission is from soil and vegetation on which fecal matter containing eggs has been deposited.
¤ Intimate contact with pets which have been in contact with contaminated soil may result in infection
❇ الامراضية
❇ Pathogenesis:
Generally the disease passes in 2 stages:
1-Migratory stage larva pass to the lung leads to loffler`s syndrome.
In heavy infection, larva passes to venous circulation then to the heart then go to different body organs causing visceral larva migrains.
2-Intestinal stage
In this stage Ascariasis symptoms include:
▶ Nutritional deficiency (Ascaris takes most of its nutrients from the partially digested host food in the intestine)
▶ Indigestion and malabsorption due to production of anti enzymes interfere with digestion (specially protein indigestion)
♦Complications:
Heavy worm infection may cause intestinal obstruction .
#Parasitology
@LabMed2016
Ascaris lumbricoides (A) adult male; (B) adult female (arrow shows vulvar waist)
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Ascaris lumbricoides Ova types
♻LIFE CYCLE of Ascaris lumbricoides
♻LIFE CYCLE of Ascaris lumbricoides
التشخيص المخبري للاسكارس
✺ Laboratory diagnosis Ascaris lumbricoides
⇛Detection of the parasite.
→Egg detection(stool examination)
— fertilized and unfertlized eggs.
→Adult worm detection
—X-ray (Trolley car lines), USG and Barium meal of GIT
→Larva detection (sputum/gastric aspirate)
⇛Serology (antibody detection)
—ELISA, IFA, IHA test
⇛ Other findings such as eosinophilia and
charcot leyden crystals in sputum and stool