You are here Home Glossary of technical terms Glossary of technical terms bacteria Listen Print Share Twitter Facebook Email Microorganisms that are smaller than a blood cell, but bigger than a virus; examples of diseases caused by bacteria are diphtheria, tetanus, pertussis, Haemophilus influenzae type b (Hib) and tuberculosis Page history Last updated 11 June 2018 Last reviewed 11 June 2018 Is there anything wrong with this page? Help us improve the Australian Immunisation Handbook What you were doing? (required) What went wrong? (required) Leave this field blank