How soon after infection with ebola virus can ebola antigen be detected? what is the sensitivity of the ebola antigen test?

Difficult to answer: Diagnosing Ebola in a pt who has been infected for only a few days is difficult, because the early symptoms, such as fever, are nonspecific to Ebola and are seen often in pts with more commonly occurring diseases, such as malaria and typhoid fever. Antigen-capture enzyme-linked immunosorbent assay (ELISA) IgM testing and Polymerase chain reaction (PCR) can be done a few days after symptom onset.

Ebola antigen: In one study surface-enhanced Raman scattering (SERS) tags were used to detect antigens from Ebola clinical blood samples collected from the 2014 which showed Ebola detection with 90.0% sensitivity. REF: https://www.medtechdive.com/news/rapid-diagnostic-test-detects-ebola-malaria-in-the-field/544382/#:~:text=Results%20demonstrated%20Ebola%20detection%20with,funded%20by%20the%20Paul%20G.