HEV: This stands for Hepatitis E Virus, which is a virus that can cause hepatitis, an inflammation of the liver. There are different genotypes of HEV, and it is usually transmitted through contaminated water or food. IgG: Immunoglobulin G (IgG) is a type of antibody produced by the immune system in response to an infection. The presence of IgG antibodies suggests a past or previous infection with the hepatitis E virus. IgM: Immunoglobulin M (IgM) is another type of antibody produced by the immune system. The presence of IgM antibodies suggests a recent or acute infection with the hepatitis E virus. The rapid test cassette typically contains specific antigens from the hepatitis E virus. When a blood sample is applied to the test cassette, it migrates through the device, and if antibodies against HEV (IgG and/or IgM) are present in the blood, they will bind to the antigens on the test line, causing a visible reaction (e.g., a colored line). This reaction can be interpreted by a healthcare professional to determine whether the patient has been exposed to HEV and, if so, whether it is a recent or past infection.