HIV and AIDS
HIV – Human Immunodeficiency Virus AIDS – Auto Immune Deficiency Syndrome
• HIV is the name given to a virus
• HIV affects your immune system (the way your body fights illness and infection)
• HIV stops your immune system from working properly so that your body can no longer defend itself. This is AIDS.
Influenza (flu), Polio, Smallpox
Viruses are microbes
They consist of -
DNA or RNA (which hold the information about the virus, like your DNA)
A protein coat (to protect the DNA/RNA)
How a virus ‘works’
A virus is a parasite which cannot reproduce on its own,
it needs another living thing to survive
It infects the cells of your body and ‘hijacks’ them
(Adsorption & Entry)
Your cells stop doing what they’re supposed to and
instead make copies of the virus
(Replication & Assembly)
The new viruses are released and go
on to infect other cells
Viruses have characteristics of living things but, in some ways, could be said to be non-living – what do you think?
Remember – Living things
- Get rid of waste
- Need energy
A virus needs to make its way from one ‘host’ to another
This can happen in different ways
Transfer of body fluid
Through a ‘carrier’ (malaria)
HIV is transferred ONLY through transfer of body fluid
Can you think of any examples of body fluids that could spread HIV?
How much of each body fluid do you think needs to be transferred for someone to become infected with HIV?
How does AIDS affect you?
HIV stops your immune system from working properly
This means an illness that is not very serious for you and me can become life threatening to someone with HIV
People do not die from AIDS, they die because their bodies cannot fight off infections from other disease-causing organisms