Residual anonymized samples stored at -80°C at the Tropica Biobank of the DITM and for which diagnostic analysis for germ infection has previously been carried out at the DITM by blood culture and MDR surveillance in routine diagnostic rectal swab will be used.

Real time PCR assays will be used for the identification of infecting microorganisms and the drug resistance they carry that allow their identification, such as KPC, VIM, IMP, NDM, Acinetobacter OXA, Oxa48, MCR.

The validation of the method will be carried out in 100 (based on availability in Tropica Biobank) clinical samples: blood n=50 (positive, as for the negatives reference will be made to those already provided in the GENRES study) and rectal swabs ( positive n=40 and negative n=10) provided by the DITM. Sensitivity and specificity will be analyzed. As a reference for positivity and negativity data, reference will be made to routine diagnostic data obtained through standard operating procedures at the DITM laboratories.

Results (positive/negative and microorganism identification) obtained by real time PCR.

Results (resistant/susceptible) obtained by real time PCR in the identification of gene mutations that convey resistance to antibiotics.