Table 2. Sensitivities and specificities of fecal pyruvate kinase embryonic isoform M2 (M2-PK) and calprotectin (FC) in identifying patients with acute diarrhea caused by infection with rotavirus (AD-RV) and Salmonella enteritidis (AD-SE) among healthy subjects. Data are presented as sensitivity and specificity (at cut-off value).

	M2-PK		FC
	standard cut-off	best cut-off	standard cut-off	best cut-off
AD-RV	72.4% and 90.0%	89.7% and 82.9%	55.2% and 97.1%	89.7% and 80.0%
	at 4.0 U/g	at 2.2 U/g	at 15.0 μg/mL	at 3.2 μg/mL
AD-SE	100.0% and 90.0%	95.2% and 100.0%	100% and 97.1%	100% and 97.1%
	at 4.0 U/g	at 10.3 U/g	at 15.0 μg/mL	at 15.0 μg/mL