Got Scabs?

Hannah Rosenberg and Michael Kessler

All About Viruses


Viruses contain enzymes, DNA or RNA, and have a protein coat called a capsid. Some more advanced viruses also have lipid membranes called envelopes.

What they do to cells and reproduction:

-viruses attach to the cell

-they inject the DNA or RNA, which takes over the cell

-cell begins to create virus parts, which make up the viruses

-viruses break free and host cell is killed (cell lysis)


-Viruses are measured in nanometers (10-50)

-they cannot be seen without an electron microscope

Viruses are not living:

They have no metabolism, cannot reproduce on their own, cannot move, have no respiration, do not eat, and do not contain cellular structures.

Lytic Cycle:

-fast track infection

-quickly eliminated by immune system

Lysogenic Cycle:

-long term infection

-virus remains dormant in cells for long periods of time and is reproduced with the cell

Smallpox- variola major and variola minor


-spread through contact with bodily fluid, face to face contact within six feet of an infected person, or contact with a contaminated object


-muscle pain

-rashes, scars, scabs, bumps

-death or eventual blindness

There are no treatments, and the virus is often fatal.

Smallpox has been eradicated, so there is no longer any risk of contracting it.

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