Harmful or Helpful?

Harmful Microorganisms
http://www.kidshealth.org/kid/watch/house/salmonellosis.html
http://www.kidshealth.org/kid/watch/house/salmonellosis.html
http://www.kidshealth.org/kid/stay_healthy/food/ecoli.html
http://www.kidshealth.org/kid/ill_injure/sick/strep_throat.html
http://kidshealth.org/kid/ill_injure/sick/flu.html
http://www.epi.state.nc.us/epi/oii/mold/
http://www.amnh.org/nationalcenter/infection/index.html

Beneficial Microorganisms
http://www.biology4kids.com/files/micro_goodbad.html
http://www.herbarium.usu.edu/fungi/funfacts/penicillin.htm
http://www.usoe.k12.ut.us/CURR/Science/core/6th/SCIBER6/microbes/html/micbenef.htm
http://www.mcwdn.org/Animals/PROTOZOA.html
http://www.bbc.co.uk/history/historic_figures/pasteur_louis.shtml
http://www.sjsu.edu/depts/Museum/flemin.html