In addition, all positive samples were
tested for the occurrence of staphylococcal enterotoxins A, B, C and D
by reverse passive latex agglutination (SET-RPLA-Toxin Detection kit,
Thermo Fisher Scientific, Wesel, Germany) according to the
manufacturer's instructions with one exception (use of brain heart infusion
broth (Becton-Dickinson Heidelberg, Germany) instead of tryptone
soya broth).