Taenia saginata
HABITAT
Small intestine (upper jejunum)
CESTODES
Unarmed Beef Tape worm
DISTRIBUTION
World wide
Not found in vegetarains who do not eat beef
Goeze in 1782 differentiated this tape worm from that of Taenia solium
CAUSE
Intestinal taeniasis
MORPHOLOGY
ADULT WORM
EGG
White,flattened&measuring 4-10 even 15 min length
SCOLEX
1.5mm in size
With 4 well developed suckers
Rostellum and hooks absent
NECK
Short & fragile
0.5 mm in width
STROBILA (TRUNK)
1000 TO 2000 proglottids seen
Mature segments - 12mm more broad than long
Gravid segments - narrower and longer
Mature segment - 300 to 400 testes , developed vaginal sphincter,lack accessory ovarian lobe
Common genital pores are seen
Gravid segment -Developed uterus,15-30 lateral branches
Spherical & brown in color
Measure 31-43 um in diameter
Thin transparent shell
inner embryophore is brown,thick walled
Oncosphere with 3 pairs of hooklets
INFECTIVE FORM
Cysticercus bovis
Present in cattle as infective for human
Oval , 7.5 - 9 um by 4-6 um
Consists of fluid filled bladder
Sac containing a small invaginated scolex
LIFE CYCLE
Develops adult worm in 8-12 weeks
Terminal gravid segments ecreted in fecal mass
Begin to produce chain of segments
Cattle become infected by ingesting intact gravid segments
Scolex exvaginates & attaches to intestine wall
Gravid segments release 50,000-80,000 eggs
cysterci digested in small inestine
Eggs disintegrate & release oncosphere
Ingestion of raw/uncooked beef contain cysteicercus bovis
Oncosphere are transformed into cysticercus bovis
HOST
Definite host - Man \ Intermediate host - cattle
PATHOGENICITY
CLINICAL MANIFESTATIONS
Adult worm is non pathogenic & intestinal obstruction
Intestinal taeniasis
Abdominal discomfort
Proglottids crawl around the anus
Chronic indigestion
Appendicitis
Cholangitis
LABORATORY DIAGNOSIS
MICROSCOPIC EXAMINATION
Gravid proglottids in faeces
Eggs & Scolex expelled in feces
SERODIAGNOSIS
Indirect haemagglutination
Indirect fluorscent antibody
ELISA
