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The page below is a sample from the LabCE course Reading and Reporting Gram Stained Direct Smears. Access the complete course and earn ASCLS P.A.C.E.-approved continuing education credits by subscribing online.

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Gram-positive Diplococci

Cocci that occur in pairs are referred to as diplococci. Image 2 contains many gram-positive diplococci.

Image 2

Lancet-shaped gram-positive diplococci from a lower respiratory tract specimen could indicate Streptococcus pneumoniae. Organisms that may be harbored in the upper respiratory tract gain access to the alveolar spaces by aspiration or inhalation. Image 3 is a Gram stain made from a lower respiratory tract specimen. The gram-positive diplococci can be presumptively identified as Streptococcus pneumoniae.

Image 3