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Parasitology Lab 7


Mohamed Malash

on 22 July 2013

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Transcript of Parasitology Lab 7

Lab 7
Medical Entomology
All Arthropods possess:
Exoskeleton - a hard protective covering around the outside of the body.
Segmented body
Jointed limbs and jointed mouthparts - that allow extensive specialization
Bilateral symmetry - whereby a central line can divide the body into two identical halves, left and right
Classification of Human Parasites
Study of protozoa (primitive animals)
Study of helminths (worms)
Study of
Body is divided to 3 regions
Has appendages specialized for eating and sensing environment.
Mid or chest region: to which the legs and wings are attached.
Terminal part
Phylum: Arthropoda
Class: Insecta
Class: Arachnida
Class: Crustacea
3 body segments
6 legs (3 pairs)
1 pair of antennae

2 body segments - cephalothorax and abdomen
8 legs (4 pairs)
No antennae

Two body regions
Mainly aquatic
Varied number of legs (at least 5 pairs)
2 pairs of antennae
Medical importance:
1- Vector for plague
2- Transmit endemic typhus or murine typhus
3- Intermediate host for H.diminuta, D. caninum
Louse (pl. lice)
Pediculus humanus corporis (body)
Medical importance:
1- Pediculosis (heavy infestation with lice)
2- Could transmit trench fever, epidemic typhus & epidemic relapsing fever
Bed Bug
Medical importance:
1- Irritation of the skin, skin rashes and allergic symptoms.
2- Insomnia.
Triatoma infestans (kissing bug)
Medical Importance:
The most important vector of Trypanosoma cruzi that causes Chagas disease.
Female Anopheles mosquito.
The resting position of the adult is characteristic, head and abdomen in a straight line at an angle of about 45° with the surface on which they rest.
Culex mosquito
Medical Importance:
Vector of malaria and Elephantiasis (bancroftian filariasis)
Vector of Elephantiasis (bancroftian filariasis)
Tse tse fly
(vector of sleeping sickness)
Sand fly
(vector of leishmaniasis)
Hard Tick
Composed of false head without antenna, thorax fused with head (cephalothorax), abdomen is not segmented, 4 pairs of legs
The mouthparts are difficult to see from a dorsal view. The soft ticks have a granulated leathery appearance.
Soft Tick
The primary difference between hard ticks and soft ticks is the shiny shield-like scutum present on hard tick specimens which is found along the dorsal section of the body
Medical Importance:
1- Mechanically: bite, bleeding
2- Systemically: tick paralysis
3- Could transmit rocky mountain spotted fever, Q fever and Tularemia
Oval. Thorax fused with head (cephalothorax), abdomen is not segmented. 4 pairs of legs.
Sarcoptes scabei (itch mite)
Medical importance:
Sarcoptes scabei cause scabies
Composed of cephalothorax carrying 1 median eye, 2 pairs of antennae, abdomen is segmented into 4 or 5 segments, female carry 2 egg pouches, last segment carry legs.
Medical importance:
Intermediate host for: Diphylobothrium latum, Diphylobothrium mansoni & Dracunculus medinensis
Head with antennae, thorax and abdomen. 3 pairs of legs. bilaterally compressed
Composed of head with antenna, thorax carrying 3 pairs of legs, abdomen formed of 9 segments (incompletely segmented)
Class: Arachnida
Class: Crustacea
Full transcript