The External Quality Assurance System 2002 of the WHO Global Salmonella Surveillance and Laboratory Support Project (Global Salm-Surv)
An international external quality assurance program on serotyping and antimicrobial susceptibility testing of eight Salmonella enterica strains was performed to enhance the capacity of national and regional reference laboratories in WHO Global Salm-Surv (WHO GSS). In 2002 a total of 117 laboratories from 67 countries participated. For serotyping, almost 90 % of the results were correct. For susceptibility testing, 91 % of the results were in agreement with the expected results, and 86 % of the performed tests with the reference strain E. coli ATCC 25922 were inside the quality control range specified by NCCLS guidelines. Comparing the results of EQAS 2002 to the results from 2000 and 2001 showed a clear improvement in the laboratories capacity to accurately serotype and susceptibility test Salmonella. We attribute this improvement to the training provided by WHO GSS, the EQAS and the highquality Salmonella typing antisera, provided to most participants as a part of the WHO GSS.
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Danmarks Tekniske Universitet, Fødevareinstituttet, 2003