Viruses
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Viruses. “They Are Not Alive!”. Viruses. Non-Living?. Viruses DO NOT : Metabolize on their own Reproduce Move Take in food Grow Consist of cells. What they can do is take a host cell “ Hostage”. Bacteriophage. Consist of a protein coat called a Capsid Contain Viral DNA

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Viruses

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Viruses

Viruses

“They Are Not Alive!”


Viruses1

Viruses


Non living

Non-Living?

Viruses DO NOT:

  • Metabolize on their own

  • Reproduce

  • Move

  • Take in food

  • Grow

  • Consist of cells


What they can do is take a host cell hostage

What they can do is take a host cell “Hostage”


Bacteriophage

Bacteriophage

  • Consist of a protein coat called a Capsid

  • Contain Viral DNA

  • Special Ligands allow the virus to attach to the cell receptors of a host cell.


Viral infection

Viral Infection

A virus can reproduce in two ways:

1.The Lytic Cycle: infects and affects the host cell very quickly. Flu, Ebola, Cold

2. The Lysogenic Cycle: infects but does not affectimmediately HIV, Herpes


The lytic cycle

The Lytic Cycle


The lysogenic cycle

The Lysogenic Cycle

INCUBATION PERIOD


Lytic cycle animation

Lytic Cycle Animation

  • Lytic Cycle #2

  • Virus Attack

  • H1N1

  • Lytic Infection PH


Viral infections

Viral Infections

  • Small Pox

  • Chicken Pox

  • Herpes

  • Hanta

  • Mumps

  • Measles

  • Polio

  • Hepatitis

  • West Nile

  • Corona

  • Encephalitis

  • Influenza

  • Meningitis

  • Ebola

  • HIV

  • Lassa Fever

  • Mononucleosis

  • Rabies

  • Dengue Fever

  • Yellow Fever

  • H1N1 (Swine Flu)


Vaccines

Vaccines

  • Vaccines are used to establish immunity.

  • They can be made of weakened viruses or “dead” viruses.

  • The body recognizes and destroys the viruses. It will“remember” them so that the next time they are in the body, they will be destroyed.

  • Ex. The H1N1 Shot


More human viral diseases

More Human Viral Diseases

  • Chicken Pox

  • Mumps

  • Herpes

  • Hepatitis

  • Warts

  • How big are Viruses?


Viroids and prions

Viroids and Prions

  • Viroids

    • Infections agents composed of a single, circular strand of RNA. They are not protected with a protein coat.

    • Viroid RNA does not code for any known protein.

    • Mostly affect plants but recently have been found to affect humans.


Viroids and prions1

Viroids and Prions

  • Prions

    • An infectious particle made of protein

    • Affect the brain or neural tissue.

    • All are untreatable and fatal

    • Ex. Mad Cow Disease


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