False-positive immunochromatographic CTX-M enzyme test from direct testing of a positive blood culture.

1 NG-Test CTX-M Multi and Carba5 test results for a positive blood culture fluid prepared by different sample preparation methods, culture plate isolate, and serum from the case. The sample preparation methods and test procedure are described in supplementary file The NG-test CTX-M MULTI and Carba5 assays use mouse antibodies to detect antigens [[4]]. Result for (a) blood culture fluid, simplified method; (b) blood culture fluid, Septityper method, (c) blood culture fluid, SDS method; (d) blood culture fluid, Triton X method; (e) culture plate isolate, manufacturer method; (f) blood culture fluid, simplified method; (g) and (h) serum, simplified method. [Extracted from the article]