Research staff from the Polytechnic University of Valencia (UPV), belonging to the Centre for Research and Innovation in Bioengineering (Ci2B), in collaboration with the FISABIO—Doctor Peset University Hospital Foundation, have developed a new ELISA-type immunologic test to study the seroprevalence against SARS-CoV-2. The test, in prototype phase, makes it possible to detect IgG and IgM antibodies against the virus from human serum. It stands out due to its low cost compared to other existing tests on the market, as well as for its high sensitivity and reliability—classic characteristics of ELISA tests.