1. It is a strand of hereditary material surrounded by a protein coating.
What is a virus?
It is a strand of hereditary material surrounded by a protein coating.

2. Viruses They lack a cell membrane Don’t have a nucleus
Don’t have organelles
They have a variety of shapes
They are too small to be seen unless you use the electron microscope

3. How do they multiply
They make copies of themselves- good for them, but bad for you
They cannot make a copy of themselves without the help of a living cell
So…. Are viruses living?
Scientist still debate over this today

4. What a virus does They enter the cell and can become
Latent or inactive for awhile
Be active

5. Active Virus It tricks the host cell into making new viruses
This actually destroys the host cell

6. Latent Virus
It’s hereditary material can become part of the cell’s hereditary material.
It does not immediately copy itself
It does not immediately destroy the cell
When the host cell reproduces it actually is copying the viral DNA instead
When certain conditions become just right it can activate the virus

7. Cold Sores
When a cold sore appears on your lip it is a latent virus becoming active in your body
While the virus is active it is destroying the normal cells in your lip
When the sore disappears it has became latent again
It is basically hiding in your body waiting for the time to become active again

8. Cold Sore

9. A virus cannot move by itself
It can be carried by wind
It can be spread through air after coughing or sneezing then inhaled by an animal
WATCH

10. Bacteriophages Viruses that infect bacteria
The differ from other viruses because they enter a bacteria and release their hereditary material
This whole cycle take ONLY 20 minutes then the affected cell releases an average of 100 viruses!!!

11. Vaccines We use vaccines to prevent diseases
A vaccine is made from a weakened virus particle that cannot cause a disease anymore
Vaccines are the reason you have not had measles, mumps, small pox, chicken pox, polio or even rabies!
BE glad you are lucky enough to get vaccines- children die everyday from these disease because they don’t have a simple vaccine

12. Thank goodness we live in America!

13. Cow pox

14. The first vaccine Developed by Edward Jenner In 1796
He developed a vaccine for small-pox
He noticed that people who got cowpox did not get smallpox
He prepared a vaccine from the sores of people with cowpox and injected it into healthy people to keep them from contracting smallpox (which kills)

15. antibiotics Are not effective against viral disease
You body can only stop the virus by making interventions
Antiviral drugs are available for certain types of viruses
Mostly we avoid viruses by vaccinating people, & being sanitary

16. BREAKING NEWS Helpful Uses??
You might be wondering how a nasty virus could help someone
Gene Therapy- Scientist are experimenting with viruses to help people with genetic disorders and some are hopeful that this could be a cure for cancer someday
BREAKING NEWS