Volume 74, Issue 5
  • ISSN: 0002-9637
  • E-ISSN: 1476-1645


The chessboard modification of the quellung method for serotyping (Pneumococcus) was introduced in the Gonoshasthaya Vaccine Research Laboratory, a small laboratory in Bangladesh. We applied initial bench-side training and subsequent continuous surveillance and quality assurance as approaches for good laboratory practice. Results obtained a this laboratory on 1,101 consecutive isolates had satisfactory sensitivity (85.1–100%) and specificity (97.9–99.9%) for serotyping the 10 most common serogroups/types of pneumococci when compared with the results obtained in the Finnish reference laboratory for pneumococcal serotyping at the National Public Health Institute. We conclude that serotyping of pneumococci by the chessboard method can be introduced into a small laboratory by providing basic bacteriologic skills, adequate initial training, and continuous external support.


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  • Received : 18 Apr 2005
  • Accepted : 29 Aug 2005

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