Common cold is one of the most baffling diseases known. Cures and preventive measures are lacking, and yet the disease seems to cure itself after several days of sneezing and fever. This disease has been tracked to lifeforms in the Rhinovirus genus.

The family Picornaviridae contains several genera of viruses that can cause serious diseases. Enterovirus (poliovirus) is linked to polio. Rhinovirus is linked to the common cold. Hepatovirus is linked to hepatitis A.

Typical viruses include tiny organisms that contain both a nucleic acid and some proteins. Many of these cause serious illness in humans. Included herein is AIDS, yellow fever, Mumps, Measles, and Hepatitus. Estimates indicate that over 30,000 species are under study with only about 3,000 recognized.

e have lumped all the virus like lifeforms herein, as science is still working on the taxonomy tree in this area.

Viruses are the most primitive of lifeforms. These organisms are usually too small to be seen by typical microscopes. Viruses are composed of a acid nucleus and some proteins. These organisms need to invade a living cell of a host in order to grow and reproduce. Several well known diseases are caused by viruses including Hepatitis, HIV, Mumps, Influenze, Rabies, and Yellow Fever.

There are several even more primitive virus like creatures that include viroids and prions. (Viroids can cause some plant health issues, and Prions can cause the mad cow disease.)

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