.]]Gram staining is a quick procedure used to look for the presence of bacteria in tissue samples and to characterise bacteria as Gram-positive or Gram-negative, based on the chemical and physical properties of their cell walls.[1] The Gram stain should almost always be done as the first step in diagnosis of a bacteria infection.
The Gram stain is named after the Danish scientist Hans Christian Gram (1853 ? 1938), who developed the technique in 1882 and published it in 1884 as a technique to discriminate between two types of bacteria with similar clinical symptoms: Streptococcus pneumoniae (also known as the pneumococcus) and Klebsiella pneumoniae bacteria.[2]
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