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Strategies for Gram Positive Bacterial Identification

Gram positive cocci are among the most commonly-encountered and studied bacteria in a microbiology lab.  The same is true in the Virtual Lab.  Though there are numerous Gram positive cocci, some very common and others very exotic, the most commonly studied species in a microbiology teaching lab are the Staphylococcus spp. and Streptococcus spp., or the "staphs and streps".  These two basic groups are the bulk of the 50+ Gram positive cocci included in VUMIEtm 2012.    

The process of identification in VUMIEtm 2012 centers on comparison of the results of biochemical tests on the unknown organism with results reported from known species.  Luckily, there are several standard tests that are commonly used to begin the ID process.  By completing these, the number of possible identities for the unknown can be reduced to a handful from the 50+ included in the software.

For an overview of how Gram positive cocci are identified in the Virtual Lab, and the strategies used to get an ID, work through Micro Digital Media Exercise 14.  

Follow your instructor's advice on what needs to be done and whether a lab report is required.  

When done, you may be asked to take a quiz over this material.