Emerging Disease

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6. Emerging and Re-emerging Diseases Chapter 8

Disease is not constant
• Emerging Diseases – are recently “discovered” diseases, or diseases that have become increasingly important. • Some are old diseases just discovered – like Hepatitis C • Some are truly new like HIV • Many are taking advantage of some niche – like air conditioners in large buildings – Legionella pneumophila • Diseases moving to new parts of the world – West Nile Virus • Re-emerging Diseases – are diseases that became less important, but are again increasing in importance. • Tuberculosis is an old disease that is again rapidly increasing in some populations.
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Health Science Microbiology David L. Beck, B.S., A.M., Ph.D.

FYI

Emerging Diseases - Examples

FYI Re-emerging Diseases - Examples

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Known Species
The Tip of the Iceburg
• How many species are there? • 1980 there was 1,792 described species • 1990 there was 3,393 species (173 new per year) • 2000 there was 6,386 species (299 new per year) • 2010 there was 12,926 species (654 new per year) • Oct 2011 there was 13,563 species (Yikes!!!) (Most of these we know nothing about other than their name.) WE KNOW VERY LITTLE 80% of bacteria are unculturable – what you do not know about can hurt you! 61% of the known 1415 species infectious (and counting) to man are from animals (zoonoses)

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Want to know the current number of described species? See: http://www.bacterio.cict.fr/number.html Updated daily.

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Normal Flora
The Great Unknown
• • • • First no one knows. NO ONE. Second detection does not mean it is normally there. Detected: Oral Cavity • 700 species (Aas 2005 and others) many sites • 6888 to 10,052 species (Keijser 2008) two sites in 71 people Anderson 2008 • Throat 152 species • Stomach 33 - 262 species • Feces 301 species Most abundant bacteria in the mouth – Veillonella parvula –…...

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