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Background  Fecal calprotectin is largely applied as a non-invasive intestinal inflammation biomarker in human medicine. Previous studies in pigs investigated the levels of fecal calprotectin in healthy animals only. Thus, there is a knowledge gap regarding its application during infectious diarrhea. This study investigated the usefulness of fecal calprotectin as a biomarker of intestinal inflammation in  Brachyspira hyodysenteriae  and  Salmonella  Typhimurium infected pigs.    Results  Fecal samples from pigs with colitis ( n  = 18) were collected from animals experimentally inoculated with  B. hyodysenteriae  ( n  = 8) or from sham-inoculated controls ( n  = 3). Fecal samples from pigs with enteritis ( n  = 14) were collected from animals inoculated with  Salmonella enterica  serovar Typhimurium ( n  = 8) or from sham-inoculated controls ( n  = 4). For both groups, fecal samples were scored as: 0 = normal; 1 = soft, wet cement; 2 = watery feces; 3 = mucoid diarrhea; and 4 = bloody diarrhea. Fecal calprotectin levels were assayed using a sandwich ELISA, a turbidimetric immunoassay and a point-of-care dipstick test. Fecal calprotectin levels were greater in colitis samples scoring 4 versus ≤ 4 using ELISA, and in feces scoring 3 and 4 versus ≤ 1 using immunoturbidimetry ( P  < 0.05). No differences were found in calprotectin concentration among fecal scores for enteritis samples, regardless of the assay used. All samples were found below detection limits using the dipstick method.    Conclusions  Fecal calprotectin levels are increased following the development of colitis, but do not significantly change due to enteritis. While practical, the use of commercially available human kits present sensitivity limitations. Further studies are needed to validate the field application of calprotectin as a marker of intestinal inflammation.    Supplementary Information  The online version contains supplementary material available at 10.1186/s40813-021-00228-9.

Experimental infectious challenge in pigs leads to elevated fecal calprotectin levels following colitis, but not enteritis