Changes

Microbes are tiny organisms (including [[viruses]] and [[bacteria]]) that can only be seen with a [[microscope]].<ref>http://www.cdc.gov/vaccines/about/terms/glossary.htm#m</ref>

Microbes is tiny organisms (including [[viruses]] and [[bacteria]]) that can only be seen with a [[microscope]].<ref>http://www.cdc.gov/vaccines/about/terms/glossary.htm#m</ref>

==References==

==References==