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291052A

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Image #   291052A
Name:   Streptococcus salivarius - Gram-positive, rod prokaryote (bacterium)
Copyright:   Copyright 2009 Dennis Kunkel Microscopy, Inc.
Description:   Caption: Streptococcus salivarius - Gram-positive, coccoid, facultatively anaerobic prokaryote (bacterium). Streptococcus salivarius forms chains of cells which are bound together by the capsular material seen around each cell (shown as surface stipulation in this image). It is the principal commensal bacterium of the oral cavity and a normal inhabitant of the upper respiratory tract in humans. It is the first bacterium that colonizes dental plaque, before being joined by numerous other species of various genera. It creates favorable conditions so other species can begin to colonize. It is also a bacterium that plays the role of moderator, permitting the implantation of bacteria that are harmful to the health of the oral cavity. The bacterium colonizes the mouth and upper respiratory tract of humans a few hours after birth, making further exposure to the bacteria harmless. S. salivarius is considered an opportunistic pathogen and when it enters the blood stream it causes septicemia in people with neutropenia. It may cause endocarditis and dental tooth decay. The host's immune response is repelled by the bacteria's ability to alter the proteins on its surface that allow it to be recognized by the body.
Magnification*: x5,335
Type: SEM
    *(Magnifications are based on a 35mm slide image of 24mm in the narrow dimension.)
Keywords:   291052A 10.01.09 homofermentative Streptococcus Streptococcus salivarius acid environment acidic environment anaerobic bacteria bacterial flora bacterial pathogen bacterium cocci coccoid coccus dividing dental decay dental plaque dextran division enamel gamma streptococci gamma streptococcus gingivitis glucan Gram-positive Gram bacteria gram positive gum disease human disease human flora human infection human microbiota human pathogen minearlized tooth mouth mouth abscess mouth bacteria oral bacteria oral bacterium oral flora oral lesion oral microbiota oral pathogen peridontal disease periodontal infection polysaccharide prokaryote SEM septicemia streptococci oropharynx sucrose metabolism tooth decay tooth enamel tooth plaque periodontal lesion biofilm bacteria flora dental tooth decay endocarditis oral bacteria flora oral bacterial flora anaerobic bacteria anaerobic bacterium facultative anaerobe facultative anaerobic facultative anaerobic bacteria facultative anaerobic bacterium facultatively anaerobic commensal bacteria commensal bacterium respiratory tract bacteria respiratory tract bacterium upper respiratory tract human mouth human respiratory tract human upper respiratory tract respiratory tract of humans mouth micro flora mouth microbe mouth microbes mouth microorganism mouth microorganisms opportunistic bacteria opportunistic bacterium opportunistic pathogen opportunistic pathogens oral cavity flora neutropenia colonizing dental plaque dental plaque bacteria dental plaque bacterium dental plaque colonizer pathogenic bacteria pathogenic bacterium urease

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