Types of Pathogen

1. TYPES OF PATHOGEN

2. PATHOGENS
Tiny microorganisms that causes many of the
most common diseases.
It infects or invades the body and attacks its
cells and tissues.

3. TYPES OF PATHOGEN
BACTERIA
RICKETTSIAE
VIRUSES
FUNGI
PROTOZOA
PARASITIC WORMS

4. BACTERIA – one-celled microorganisms that rank
among the most widespread of living things.
Most bacteria do not cause diseases. In order to live,
all bacteria must have a food supply, as well as
suitable temperature, moisture, and darkness. Some
bacteria digest non-living food materials such as
milk and meat. These are called saprophytes. If the
food supply is a living plant or animal, the
microorganism is called a parasite. The plant or
animal that the parasite feed on is called a host.

5. Toxin bacteria produce a certain food poison
called botulism. These bacteria live in the soil
.
Resident bacteria live in the human mouth,
intestines, and skin. These help protect us
from harmful bacteria.

6. RICKETTSIAE – are organisms that are considered
intermediate, that is , somewhere between a virus and a
bacterium.
Grow in intestinal tracts of insects, which carry them
to their human host.
Requires living cells in order to grow and multiply
Blood sucking insect, such as lice, mites, and tics carry
rickettsia to humans,

7. VIRUSES – are small, simple life-like forms from one-
half to 1-00 the size of bacteria. These organisms are
human body’s worst enemies
All viruses are parasites
Examples
Rabies , Cold ,Viral hepatitis, Mumps and
mononucleosis ,Smallpox, chicken pox, etc.

8. FUNGI – are simple organisms that cannot
make their own food.
Many live on dead animals, insects and leaves
Saprophytes
Two most common fungi – yeast and
mushrooms

9. PROTOZOA –are single-celled organisms that are larger
than bacteria and have a more complex cellular
structure.
Most of these are harmless and they are most
common in tropical areas that have poor
sanitation.
They cause malaria, and amoebic dysentery a
sever intestinal infection

10. PARASITIC WORMS- a worm is classified
as a parasite. Also called helminths
Common helminths
1. Roundworms – hatch and live in the intestines. The eggs enter
the body through contaminated water, food, fingers placed in
the mouth.
2. Pinworms -also called seatworms and threadworms. The eggs
usually enter the body through the anus, nose, or mouth
through inhaled air or fingers that have touched a
contaminated object.

11. 3.Tapeworms – live in the intestines. The eggs usually
enter the body via raw or uncooked beef. .
4.Flukes- Live in the different location in the body,
including intestines, bladder, rectum, liver, lungs and
vein. Flukes first mature inside fresh water snails.
After leaving the snails, they can enter the body of
humans by penetrating the skin or persons
swimming, bathing, or washing in water where
flukes are active.