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Pathogen
病原體
Introduction
Pathogen means some substance that will
cause infectious disease of man.Their success
depends large amount of it.
Pathogens are include:
 Viruses(病毒)
 Bacteria(細菌)
 Fungi(真菌)
 Protozoa(原生動物)
Transmission
Inhalation of droplets
Direct contact with infected area
Ingestion of food or water contaminated
by the excreta of host
Trough contamination of skin wounds
By vectors such as insect and rodents
By wind
Question
Which group of
pathogen is the sars
belongs to?And
what is it called.
It belongs to
viruses.It is called
corona virus.
Viral disease
Virus can replicate itself
Virus will cause
biological
malfunctioning of cells
and organs
E.g. Smallpox,
Measles,Influenza,
AIDS, Hepatitis B
—HIV
—Sars
Question
What is the different
between cold and
influenza?
Influenza will get fever
and cough.Human will
feel tire and pain.It is
more serious then cold.
Bacterial disease
Bacteria cause disease
directly destroying the
body tissues
Releasing toxins from
their cell to cause harm
Cause food poisoning
E.g. Tuberculosis
—Cocci
—Spirilli
Fungal disease
Fungal disease can be
divided into three groups
Infection
I.e.athlete’s foot ,ringworm
Food poisoning
I.e.poisonous mushroom
Allergic reaction
I.e.Hay fever, Farmer’s
lung
—Yeast
—Toadstool
Protozoan disease
Include amoebic dysentery and malaria
It can live anywhere that contain moisture
content.
But they still affected by temperature,pH
value,amount of oxygen,
變形蟲
(Amoeba)
草履蟲
(Paramecium)
Pathogen of plants
Affect the growth of plant
Infect the seed and transmit
to another seed
Transmission:
Irrigation, by wind, by seed
Example:
Pythium aphanidermatum
(根腐病)
Rhizoctonia solani
(立枯絲核菌)
Pathogen of domesticated
animals
Hand foot mouth disease
Transmission:
Skin wounds, Excreta
Latent period: 3~7days
At first,the symptom of
this disease just like catch
cold.then it seems red
swelling and swollen
appear on the skin.
Pathogen in Hong Kong:
Norwalk Virus(諾沃克病毒)
Strong contagious disease(高傳染性病)
Transmit by Inhalation of droplets,Ingestion
of food or water contaminated by the
excreta of host.
Symptom: diarrhea, fever, vomit
What can do: drank more water, keep fresh
air, cook the food completely, wash your
before eat and after go to toilet.
Question
How do our body
defend prevent
pathogen from entry
into our body.
細菌小子
>
Body Defend
Phagocytes
It engulf the pathogen
and destroy them.
After phagocytosis, the
phagocytes are also be
destroyed.
The mixture remain is
known as pus(膿)
Blood Clotting
Fibrin and platelets
are that part in it.
Fibrin act like a
net,catching blood
cells and sealing off
the wound.
~End~