Download Infectious Diseases

Infectious Diseases
Chapter 11.3: page 460-442
Chapter 12.1: page 492-496
• 7.03: Students will look trends to
determine how an infectious disease
may spread.
• VOCABULARY:
▫ Infectious disease
▫ Carrier
▫ Vector
• Have you ever been sick before?
What do you know about how the
disease you had spread?
What is an infectious disease?
• An infectious
• EXAMPLES:
▫ Strep throat
disease is an
▫ A cold or flue
illness that passes
▫ Chicken pox
from one organism
▫ Tetanus
to another.
▫ Athlete’s foot
• Most infectious
diseases are caused ▫ African sleeping
sickness
by bacteria, viruses,
fungi, or protists.
Which is NOT an example of an
infectious disease?
• A) AIDS
• B) Tuberculosis
• C) Brown hair
• D) Pneumonia
How do infectious diseases spread?
• Diseases can spread by:
▫ Contact with an infected person
such as touching, hugging, kissing,
sneezes, or coughs
▫ Contact with a contaminated
object.
▫ Contact with an infected animal.
▫ Soil, food, or water.
 EXAMPLE: Eating meat that has
not been cooked properly can
cause food poisoning.
A person gets malaria from a
mosquito. This illness was caused
by ___.
• A) Contact with an infected
person.
• B) Contact with an infected
animal.
• C) Contact with an infected
object.
• D) Contact with contaminated
food, soil, or water.
How is
cholera
likely
spread?
A) Animals
B) Soil
C) Water
D)Undercooked
food
Which pump is
likely the
source of
contaminated
water?
A)1
B)6
C) 7
D)9
Carriers
• Some organisms may transmit
diseases without knowing it. If
someone has the disease, but
doesn’t show any symptoms, they
are carriers and can cause
someone else to get sick.
▫ EXAMPLE: When someone gets
measles, they do not show any
symptoms for several days. In that
time, they can infect others.
Which is the main risk associated
with being a disease carrier?
• A) A person may be a carrier of a mild
illness.
• B) A person can unknowingly spread the
disease to others.
• C) A person may feel guilty for making other
people sick.
• D) A person is more difficult to cure if he or
she is a carrier.
B
Which best describes the danger
associated with carriers of an
infectious disease?
• A) The carrier may develop symptoms of an
infectious disease.
• B) The infectious disease may become resistant
to antibiotics.
• C) The infectious disease will mutate into a
genetic disease if left untreated.
• D) The carrier may unknowingly transmit an
infectious disease to many people.
D
Which carrier would most likely infect
the highest number of individuals?
• A) a doctor
• B) a librarian
• C) an engineer
• D) a flight attendant
D
Vectors
• Vectors are what transfer a disease from
one organism to another.
▫ EXAMPLE: Ticks are vectors because they
transfer Lyme disease to humans.
▫ EXAMPLE: A human with a cold is a vector
because they can cause someone else to get
sick.
What most likely spreads diseases
such as rabies or Lyme disease?
• A) contact with an infectious animal
• B) contact with an infectious human
• C) breathing contaminated air
• D) eating contaminated food
The Anopheles mosquito transmits the
parasite Plasmodium to humans. This
parasite causes malaria. In this
situation, which is the vector of the
disease?
•
•
•
•
A) Anopheles mosquito
B) Plasmodium
C) human
D) malaria
The bacteria that causes bubonic
plague is transmitted to humans by
fleas. Which term best describes the
role of the fleas in transmitting
bubonic plague?
• A) vector
• B) carrier
• C) parasite
• D) pathogen