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Causes of
Spread of
Infectious
Diseases
Diseases
Defense
against
Diseases
STD’s
Common
Information
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Smallest know type of infectious
agent
viruses
Single celled microrganism
Bacteria
ORGANISMS THAT
RESEMBLE BACTERIA BUT
INVADE CELLS LIKE
VIRUSES
Rickettsias
Organisms that feed off dead
animals, insects, and leaves
Fungi
These single cell organisms are
larger than bacteria and are most
common in tropical areas.
Protozoams
When pathogens are spread by
physical contact
Direct Contact
When pathogens are inhaled
Indirect
Causes rabies and malaria
Animals or insects
Pathogens are spread by touching
objects
Causes the spread of pathogens
through food, water, soil and
even air
Environment
Organism that may cause illness
often called “Foreign Invader”
Pathogen
This barrier is the first line of
defense against invading
pathogens
Physical
Barriers that include tears and
saliva
Chemical
When phagocytes engulf and
destroy pathogens
Phagocytosis
Type of white blood cell that
fights pathogens
Lymphocytes
Best way not to catch STD’s
Abstinence
These are pink or reddish with
cauliflower like tops
Warts
Blister like sores in the genital
area
Herpes
Caused by a small bacterium
called a spirochete. It has four
stages
syphillis
Tiny insects that attach
themselves to skin and hair in the
pubic area
Lice
Viral infection that causes stuffy,
runny nose, and sneezing
cold
Viral infection that causes chills,
fever, headache, muscle ache,
and weakness
Flu
The immunity your body
develops to protect you from
disease
Active immunity
Is a bacterial infection of the
throat
Strep
This is known as the kissing
disease and is a viral infection
Mono