A . Z D R A G A S , P . T S A K O S A N D P . M A V R O G E N I . 2000.The Rappaport Vassiliadis (RV) and the Modi®ed Semi-solid Rappaport Vassiliadis (MSRV) methods were evaluated in 130 municipal wastewater samples and 30¯ocks of broilers. Analysis of the results showed that 71 Salmonella serotypes were isolated in wastewater samples. The positivity of the MSRV method was 33% and of the RV method, 45%. The sensitivity was 95% and 83% with the MSRV and RV, respectively. The concordance between the two methods was 89% (k 0785). One hundred serotypes were isolated from broiler internal organs and 50 from intestinal samples. For internal organs, the positivity of MSRV was 56% and of RV, 45%. For intestinal samples, the respective percentages were 28 and 22. For internal organs, the sensitivity was 100% with MSRV and 81% with RV, whereas for intestinal samples, the sensitivity was 100% with MSRV and 80% with RV. The speci®city was 100% in all cases. The concordance between the two methods was 89% (k 0790) for internal organs and 94% (k 0851) for intestinal samples.