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- Illustration of the nasal cavity, paranasal sinuses, pharynx, larynx, trachea and esophagus.

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- Todar's Online Textbook of Bacteriology chapters on bacteriology, microbes in the environment, cycles of elements, bacterial structure, bacterial nutrition, bacterial growth, bacterial metabolism,...

- Diseases and Conditions information from the Centers for Disease Control and Prevention.

- We protect and improve the nation’s health and wellbeing, and reduce health inequalities.

- The Microbiology Society is a worldwide membership organisation for scientists who work in all areas of microbiology.