Viridan Information and Courses from MediaLab, Inc.
These are the MediaLab courses that cover Viridan and links to relevant pages within the course.
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|The patient was admitted to the hospital. The sputum specimen was inoculated to sheep blood agar. Based on the colony morphology and the alpha hemolysis seen in the image to the right, the most likely identification is:||View Page|
|The name of the rapid test seen in the image, often used to differentiate S. pneumoniae from viridans streptococci, in which a drop of 10% deoxycholate was placed on an area of growth, is:||View Page|
|The spot test that is helpful in separating Enterococcus species (positive as shown in the image) from the viridans streptococci and S. pneumoniae (both negative) is:||View Page|
Illustrated in this composite image is the Gram stain of Enterococcus species (upper), illustrating gram-positive cocci arranged in pairs and short chains. The viridans streptococci generally form gram-positive cocci in long chains; the gram-positive cells of S. pneumoniae, on the other hand, may appear similar in Gram stain. In the lower right is shown a 6.5% NaCl tube. The turbidity indicates growth, a unique characteristic for Enterococcus species. In the lower left frame is an image of a bile esculin hydrolysis slant, showing a positive reaction (black pigment) characteristic of Enterococcus species. The streptococci are uniformly negative. Some strains of Leuconostoc species and Pediococcus species can grow in 6.5% NaCl and are bile-esculin positive; however, they should be ruled out because of the negative PYR reaction.