1. The document outlines the objectives and key topics of a lecture on medical entomology including identifying and classifying medically important arthropods and understanding how they transmit diseases. 2. It defines medical entomology as the branch of entomology dealing with arthropods that affect human and animal health and well-being. 3. Several common arthropods that can transmit diseases are listed along with the diseases they spread including mosquitoes transmitting malaria and flies spreading typhoid.

1. Dr. IMMANUEL JOSHUA
Junior Resident-II
Dept. of Community Medicine
Banaras Hindu University
Varanasi-221005

2. OBJECTIVES
At the end of the lecture one must be able;
1. To morphologically Identify Arthropods
2. To Classify medically important Arthropods
3. To understand the Mechanism of transmission of Arthropod borne diseases
4. To enumerate Arthropod borne diseases along with its vector
5. To know various methods of Arthropod control

3. Branch of zoology dealing with the
scientific study of Arthropods
Branch of Entomology which deals with
arthropods which affect the health and
well-being of man and vertebrate animals.
The word ARTHROPOD comes from the Greek origin
arthron, i.e. "joint", and pous (podos), i.e. "foot" or "leg",
which together mean “JOINTED LEGS".
INTRODUCTION
MEDICAL ENTOMOLOGY

4. COMMON FEATURES
EXOSKELETON
COELOM
COMPOUND EYES
SEGMENTED BODY
JOINTED LIMBS
DISTINCT HEAD

5. What is different about each of these animals?
SIZE
MOVEMENT
SHAPE
COLOUR

6. ARTHROPODS HAVING ECOLOGICAL ROLE
Maintains food web
Pollinators

7. ARTHROPODS IN PEST CONTROL
MITES
Preys on unwanted arthropods
In farm and home
WHIP SCORPION
Preys on cockroaches
and crickets
MILLIPEDES
Eats on fungi and bacteria

8. ARTHROPODS AS FOOD

9. ARTHROPODS FOR HUMAN USES
SILK
KEVLAR

10. ARTHROPODA
CRUSTACEA
INSECTA ARACHNIDA
MOSQUITO
HOUSEFLY
SANDFLY
TSETSE FLY
BLACK FLY
LICE
RAT FLEA
SAND FLEA
REDUVID BUG
HARD TICK
SOFT TICK
ITCH MITE
TROMBICULID
CYCLOPS
ARTHROPODS OF MEDICAL IMPORTANCE
SANDFLY SANDFLEA

11. 3 PARTS 2 PARTS 2 PARTS
NIL
LAND
1 PAIR or NIL
1 PAIR
3 PAIRS 4 PAIRS
NIL
5 PAIRS
2 PAIRS
NIL
LAND WATER
BODY DIVISION
LEGS
ANTENNA
WINGS
HABITAT
IDENTIFICATION OF
ARTHROPODS

12. TRANSMISSION OF ARTHROPOD BORNE DISEASES
DIRECT
BIOLOGICAL
MECHANICAL
PROPAGATIVE
CYCLO-PROPAGATIVE
CYCLO-DEVELOPMENTAL
Man to Man
through direct
contact
Disease agent
transmitted by
Vector
Scabies
Pediculosis
Diarrhoea
Typhoid
Trachoma
Only multiplication
No cyclical changes
Multiplication +
Cyclical changes
No multiplication
only cyclical changes
Filaria in
Culex
Malaria in
Anopheles
Plague bacilli
in rat flea

13. DISEASES SPREAD BY ARTHROPODS
MALARIA CHIKUNGUNYA
DENGUE JAP. ENCEPHALITIS
FILARIA
MOSQUITO
TYPHOID CHOLERA TRACHOMA POLIOMYELITIS
HOUSEFLY
KALA-AZAR ORIENTAL SORE SANDFLY FEVER
SLEEPING SICKNESS
VIRAL ENCEPHALITIS
TICK TYPHUS
RELAPSING FEVER
Q FEVER
SCABIES
SCRUB TYPHUS RICKETTSIAL POX
SANDFLY
TSETSE FLY
HARD TICK
SOFT TICK
TROMBICULID MITE
ITCH MITE

14. EPIDEMIC TYPHUS RELAPSING FEVER PEDICULOSIS
LOUSE
ENDEMIC TYPHUS BUBONIC PLAGUE CHIGGEROSIS
RAT FLEA
GUINEA WORM DISEASE
CYCLOPS
CHAGAS DISEASE
REDUVID BUG
DISEASES SPREAD BY ARTHROPODS (Contd.)

15. Results are Permanent
PRINCIPLES OF ARTHROPOD CONTROL
ENVIRONMENTAL GENETIC
BIOLOGICAL
CHEMICAL
 Source reduction
 Proper drainage
 Water management
 Cleanliness
 Health education
 Organo-phosphorous
 Organo-chlorine
 Carbamates
 Gambusia
 Coelomomyces
 Nematodes
 Protozoa
 Sterile male
 Cytoplasmic
incompatibility
 Chromosomal
translocations
BEST APPROACH
DISADVANTAGE
Resistance
Contamination
Direct hazard to
man’s health Only small scale

16. Contd.
Combining two or more methods with a view
(1) to obtain maximum results with minimum effort and
(2) to avoid the excessive use of any one method
NEWER METHODS
Insect growth regulators
Pheromones
Chemosterilants