Haemophilus Influenza

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Haemophilus influenza
By
Crystal Wade
BL 202 A
Dr. Kokan
11/10/2012

Haemophilus influenza is a gram negative rod shaped bacterium; it is a member of the pasteurellaceae family. It is aerobic but it can grow as a facultative anaerobe. From 1852 to 1933 H. influenza was thought to be the cause of influenza until its etiology was done and they discovered that it was really bacterial influenza that caused it. H. influenza does cause many other diseases. It states on Wikipedia that “H. influenza was the first free-living organism to have its entire genome sequenced. The sequencing project was completed and published in 1995” (http://en.wikipedia.org/wiki/Haemophilus_influenzae). H. influenza can be classified into two categories and that is encapsulated and unencapsulated. The unencapsulated category cannot by typed because they don’t have capsular serotypes; encapsulated H. influenza has six different strains ranging from H. influenza a, b, c, d, e, and f. H. influenza is known as an opportunistic pathogen, this means that these bacteria can live in its host without ever causing an infection. If the host becomes unimmune then H. influenza is able to infect its host because the capsule is resistant to phagocytosis and lysis. If the host has the H. influenza in its body and it is unencapsulated, it can still cause inflammation. H. influenza can cause a lot of diseases but a few of the most common are bacteremia and pneumonia. Two of the most dangerous diseases that can affect mostly children is meningitis and epiglottitis, both are life threatening. Some of the unencapsulated strains can cause ear and eye infections and sometimes sinusitis.
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