Immunochromatographic strip (ICS) assays for rapid sero-diagnosis of encephalitis in swine are attractive for field use because they give quick, on-site results with simple procedures, but reported sensitivity/specificity varies by design and comparator test—some validated ICS tests report sensitivities in the 80–85% range with specificities often >95%, so they are useful for surveillance and triage but should be confirmed by lab ELISA/RT-PCR for clinical or regulatory decisions.