Why do organisms in the upper respiratory tract


Why do organisms in the upper respiratory tract [might] change when the normal flora is replaced with transient flora? 
What are the types of streptococcal hemolysis? Describe. 
How is Streptococcus pneumonia distinguished from other streptococci that have the same hemolytic properties? What additional tests are needed or performed? 
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Biology: Why do organisms in the upper respiratory tract
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