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TAENIA etiketine sahip kayıtlar gösteriliyor. Tüm kayıtları göster
TAENIA etiketine sahip kayıtlar gösteriliyor. Tüm kayıtları göster

18 Şubat 2019 Pazartesi

Şubat 18, 2019

TAENIA SOLIUM (PORK TAPEWORM)

TAENIA SOLIUM


  The adult worms of T. solium reside or inhabit the upper jejunum. Infection has worldwide distribution.  


Morphology: 
Adult worm measures about 3 meters in length. The globular scolex has rostellum with 2 rows of hooklets. There are <1000 proglottids. Gravid proglottid liberates about 30,000-50,000 eggs. 
Life Cycle 
Embryonated eggs passed with stool are ingested by pig and the embryo is released. It penetrates the intestinal wall and is carried by vascular channels to all parts of the body. After a period of 2-3 months of development the encysted larval stage called cysticerci or bladder worm occurs in the striated muscles of the tongue, neck, trunk brain, eye, and the nervous system. The cysticercus survives for 5 years. Humans become infected by eating pork containing larvae, cysticercus cellulosae. When improperly cooked cysticercus infected meat is eaten by man, the scolex remains undigested and attaches itself to the intestinal wall and chain of proglottids begin to grow to adult worm.

Clinical Manifestations 
Resembles that of T. saginata infection.
Diagnosis 
Demonstration of eggs in stool specimen.


Prevention: 
♦ Treatment of infected persons. 
♦ Thorough cooking of pork and proper processing 
♦ Proper disposal of human excreta (good hygiene/sanitation).


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6 Şubat 2019 Çarşamba

Şubat 06, 2019

TAENIA SAGINATA (BEEF TAPEWORM)

TAENIA SAGINATA

In adult stage, T. saginata inhabits the upper jejunum where it may survive for as long as 25 years. It causes intestinal infection, Taeniasis. It has worldwide distribution. 

These are one of the true and segmented tapeworms. Their body is divided into three regions; 
1. Scolex: the hold fast organ 
2. Neck: posterior to the scolex 
3. Stobilla: the main bulk, made up of proglottids. 
Morphology: 
Adult worm measures 5-10 meters in length. The pyriform scolex has 4 suckers but no rostellum. The mature segments have irregularly alternate lateral genital pores. Each of the terminal segments contains only a uterus made up of a median stem with 15-30 lateral branches. 

Life Cycle 
The adult worm lives in the small intestine of man. Gravid segments pass out in the stool and become disintegrated and eggs come out to the soil. The gravid proglottid uterus contains about 100,000 eggs. The egg of T. saginata is round, about 40 microns in diameter. The 6-hooked embryo is enclosed in a radially striated embryophore. Eggs are ingested by an intermediate host, cattle. The 6hooked embryo escapes from its shell, penetrates through the intestinal wall into the blood vessels and is carried to the muscles where it develops into a larval stage, cysticercus bovis (made up of an invaginated /inverted head and spherical body). Infection to man takes place by the ingestion of raw or insufficiently cooked beef. In the small intestine of man, the head of the cysticercus gets invaginated and the body becomes segmented.

Pathogenecity  
Infected persons may complain of epigastric pain, abdominal discomfort, diarrhea, weight loss, hunger sensation, vomiting, etc. 

 Diagnosis 
Recovery of the gravid segments or the eggs from the stool.
 Egg of Taenia Spp 

Prevention: 
♦ Thorough cooking of meat (above 570C). 
♦ Proper disposal of human excret 


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