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A doctor usually bases a diagnosis of chickenpox on the clinical history and physical findings. However, laboratory exams can be useful. Your doctor can test blister fluid if there is a concern about secondary skin infection by Staphylococcus or Streptococcus. If the blisters are infected with bacteria, such a bacterial culture can help determine which antibiotic may be needed.
Medically Reviewed by a Doctor on 6/18/2015
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