[Microbiology] Atlas of Streptococcus, Enterococcus, and Other Catalase-Negative Gram-Positive Cocci

Streptococcus, Enterococcus, and Other Catalase-Negative Gram-Positive Cocci, Atlas of Streptococcus, Enterococcus, and Other Catalase-Negative Gram-Positive Cocci, SUBCLINICAL ATLAS, MICROBIOLOGY ATLAS, atlas in medical, tuyenlab.net

Fig 1.  Gram stain of Streptococcus. A, Solid medium. B, Liquid medium.

Fig 2.  Schematic representation of streptococcal cell wall.

Fig 3.  A β-hemolytic streptococcal colony on sheep blood agar.

Fig 4.  An α-hemolytic streptococcal colony on sheep blood agar.

Fig 5.  Streptococcus agalactiae colony growing on sheep blood agar.

Fig 6.  Schematic diagram for the differentiation of group A from group B streptococci.

Fig 7.  Gram stain of Streptococcus pneumoniae.
Direct smear of sputum from a patient with pneumonia
caused by S. pneumoniae. Note the clear, nonstained area
around the organism that represents the capsule.

Fig 8.  Streptococcus pneumoniae colonies on sheep
blood agar. The colonies demonstrate a characteristic
mucoid appearance and a concave center.

Fig 9.  Enterococcus sp. growing on sheep blood agar.

Fig 10.  Schematic diagram for identification of nonhemolytic streptococci.

Fig 11.  Schematic diagram for the differentiation of α-hemolytic streptococci from Enterococcus.

Fig 12.  Schematic diagram for the differentiation of group D streptococci from Enterococcus.

Fig 13.  Gram stain of Leuconostoc sp.

Fig 14.  Leuconostoc sp. colonies growing on sheep
blood agar. Leuconostoc spp. may produce α-hemolysis and
can resemble viridans streptococci.

Fig 15.  Schematic diagram for the presumptive identification of gram-positive
cocci. S, Susceptible; R, resistant.

Fig 16.  RapID Streptococci panel for the identification of Streptococcus spp.
A, The commercial test well cartridge containing appropriate substrates.
B, The interpretive color guide to reactions.

Fig 17.  Group A Streptococcus on sheep blood agar
showing susceptibility to bacitracin. Left, Susceptible; right,
resistant.

Fig 18.  The CAMP test for presumptive
identification of group B streptococci. Streptococcus
agalactiae shows the classic arrow shape near the
streptococcal streak.

Fig 19.  A modification of the CAMP test showing
the enhanced hemolysis produced by Streptococcus
agalactiae when a drop of extracted β-lysin is placed on
the colony.

Fig 20.  The PYR test for Streptococcus pyogenes
and Enterococcus. Left, Negative; right, positive.

Fig 21.  The bile esculin test. A positive test (left)
shows blackening of the agar. Right side is negative.

Fig 22.  Streptococcus pneumoniae on blood agar
showing susceptibility to optochin. Left, Susceptible S.
pneumoniae; right, resistant viridans streptococci.

Fig 23.  Slide agglutination test for grouping streptococci.

This is a part of the book : Textbook of Diagnostic Microbiology 4th edition 2011 of authors: Connie R. Mahon, Donald C. Lehman and George Manuselis. If you want to view the full content of the book and support author. Please buy it here: http://amzn.to/2ctxo02