 INTESTINAL PARASITES (Helminths) 
NEMATODA Order: Ascaridata
ASCARIS LUMBRICOIDES
asc1-ic
A.lumbricoides has a world-wide
distribution and is most prevalent
in tropical areas. 25% of the world population harbours the parasite.
Life cycle.
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asc2-ic
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ascaris2 |
A.lumbricoides egg: regular
fertile egg with a thick outer mammillated coat:
eggs measure 45-75 by 35-50 µm and have a yellow to brown colour.
(Formol-ether concentration).
ascaris2: A.lumbricoides
egg: fertile bile-stained egg with a thick, mammillated shell,
measuring 55-75 mm (unstained).
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ascaris2:
Courtesy of Dr. Marc Lontie:
Director of the laboratory of the
Medisch
Centrum voor Huisartsen,
Maria Theresiastraat 63a; B-3000 Leuven,
Belgium. |
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asc2b-ic
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Lykourgos
asc1-ic |
Lykourgos
asc2-ic |
A.lumbricoides: embryonated egg having a second stage (L2) larva.
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asc2b-ic:
Courtesy of Blanca E. Jiménez
Cisneros, PhD:
Instituto de Ingeniería, UNAM Ciudad Universitaria,
Coyoacán C.P. 04510 México, D.F. |
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Lykourgos_asc1-ic,
Lykourgos_asc1-ic:
Courtesy of Lykourgos-Christos Alexakis M.D. , DTM & IH
Aide Médicale Internazionale,
Thailand Mission
(21/22-26 Maesot-Maetao road, Mae Sot, Tak, 63110, Thailand)
153 Ionias Avenue, Kato Patissia,
Athens , 10445 Attiki, Greece.
Photos are taken at x40, microscope 18L, with an
Olympus camera SP-310
simply attached on the eyepiece (with maximum zoom 8.0mm) |
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asc3-ic |
AL_4903-ic |
A.lumbricoides
infertile egg: the unfertile eggs are elongated
and much larger (85-95x43-47 µm); they have a thin shell, an irregular,
mammillated outer layer and a granular contents.
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AL_4903-ic:
Courtesy of Dr. Marc Lontie:
Director of the laboratory of the
Medisch
Centrum voor Huisartsen,
Maria Theresiastraat 63a; B-3000 Leuven,
Belgium. |
asc4-ic
A.lumbricoides decorticated egg:
normal fertile eggs may lack
the mammillated layer and are referred as decorticated eggs.
asc5-ic
A.lumbricoides: partially decorticated egg;
the external layer of the capsule has lost part of its mammillated layer.
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asc6-ic |
ascaris1 |
asc6a-ic |
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asc_f
A.lumbricoides
female-24
cm |
asc6:
A.lumbricoides: immature or adult A.lumbricoides
are sometimes passed in stools.
Adult males measure 15-20 cm in length
by 0.3-0.8 cm in diameter
and have a ventrally curved tail;
adult females measure 20-35 cm in length by 0.5 cm in diameter.
Adult female.
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ascaris1:
Courtesy of Dr. Marc Lontie:
Director of the laboratory of the
Medisch
Centrum voor Huisartsen,
Maria Theresiastraat 63a; B-3000 Leuven,
Belgium. |
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A.lumbricoides-female-24
cm:
Courtesy of Dottoressa Vittoria Fabbrizi
e gruppo di Batteriologia ospedale
Civile di Teramo,
Italy. |
asc6a: Adult
Ascaris lumbricoides seen outlined
in barium meal Xray of abdomen.
asc7-ic
A.lumbricoides: fertilized egg obtained from fresh stool with concentration by zinc sulphate flotation (Faust method). Wet mount.
Objective
40 X
asc8-ic
A.lumbricoides (Adult)
Anterior region: cross section through the esophagus (Es)
with its triradiate lumen;
lateral chords (Lc) are visible and somatic muscles (Ms) in polymyarial
type. Diameter 900 x 600 micron; esophagus: 400 micron in diameter.
(H-E, 60 X) From the Editor.
asc9-ic
A.lumbricoides (Adult)
Gravid female at the mid body: uterus filled with eggs
(900 micron in diameter); Oviduct (od); Cuticle (Cu); Muscolar cells (Ms),
sarcoplasmic portion of muscle [Ms (sp)] and lateral chord (Lc) are
visible. (H-E 60 X) From the Editor.
asc10-ic
A.lumbricoides (Adult)
Gravid female at the mid body: lateral chord (Lc) and
cuticle are visible.
(H-E 160 X) From the Editor.
asc11-ic
A.lumbricoides (Adult)
At higher magnification the cuticle, the hypodermis and
the contractile portion of muscles are clearly visible.
(H-E 160 X) From the Editor.
  
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