Visit Your Local PBS Station PBS Home PBS Home Programs A-Z TV Schedules Watch Video Donate Shop PBS Search PBS
Home
Tree of LifeKeepers of the Biosphere
Dangerous Friends and Friendly Enemies
Creators of the Future

(home)Oceans of Microbes | Four Corners (to Puzzle)

Dangerous Friends and
Friendly Enemies

Microbes are everywhere humans are. We can never completely escape their presence. From the minute we are born, they are our constant companions, surrounding us and living inside our bodies. Although many microbes can cause disease, most are harmless or actually beneficial to us.

However, disease is a constant threat to our health and life. Everyone has been affected by disease sometime in his or her life. Infectious bacteria, viruses, fungi, and protozoa have existed longer than the human species.

Usually diseases are contained to small groups or areas. However, periodically a disease will spread out of control and rapidly infect a population. Epidemics are a frightening but natural occurrence. Some epidemics, such as the Bubonic Plague, can wipe out millions and spread around the world, becoming pandemics. With today's global travel, pandemics are more frightening because they can spread around the world more rapidly.

The Wonders of Microbes, on the MicrobeWorld Web site, has more information on infectious diseases.


(home)Oceans of Microbes | Four Corners (to Puzzle)

 

   

Tree of Life | Biosphere | Friendly Enemies | New Age | Game of Life
Home | Site Map


Copyright © 1999 Oregon Public Broadcasting and PBS Online