Transcript How can we contract HIV? - Hicksville Public Schools / Homepage

Do Now Quiz
1. Describe the contents of a
vaccine.
2. Identify the system in the body
that is most directly affected by
a vaccination.
3. Explain how a vaccination
results in the long-term ability
of the body to resist the disease.
LO: SWBAT understand how
HIV affects the Immune System
DN: Quiz #3- vaccines
HW: page 1052# 17-20
page 1053#31
Quiz Friday
How can we contract HIV?
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Sexual intercourse
Blood transfusion
Passed through the placenta
Open wound
Sharing needles - drugs
What is HIV?
ANTIGEN
• It is a virus that
attacks our immune
system.
• It is a retrovirus. It
has RNA not DNA as
its genetic material.
• How does our body
know this is an
enemy?
What part of our immune system
does it attack?
White blood cells
HIV attacks special WBC’s called T-Cells
How are B-cells different than
T-cells?
Make
antibodies
Send signals
to B-cells
to make
antibodies
How does HIV replicate?
HIV
Virus
T-Cell
• HIV binds to a T-cell
• It inserts its RNA
into the T-cell
• It produces HIV
DNA
• It hides HIV DNA
inside the cell's
DNA:
• This turns the cell
into a HIV factory.
How does HIV destroy our
immune system?
Effects
• You don’t die from the HIV infection,
rather you die from the
diseases/infections you get because
your body can’t defend itself. (ex:
pneumonia)
• Why cant your body defend itself?
• These infections are called
OPPORTUNISTIC INFECTIONS.
Can we make a vaccine?
It is very difficult because the virus mutates very quickly
and produces different antigens after only a few
generations.
Where is AIDS an epidemic?