The present invention provides methods, assays and kits for evaluation and assessment of IP-10 (CXCL10) expression, particularly IFN induction of IP-10, to determine the presence of inborn errors of the Type I IFN or Type II IFN response pathway and / or auto-antibodies directed against, and particularly neutralizing, Type I IFNs or Type II IFNs in a patient. The methods, assays and kits including for assessment and evaluation of individuals prior to
vaccination with live attenuated
virus vaccines, particularly including
yellow fever vaccines and COVID-19 vaccines, to assess risk for vaccine-associated
disease and adverse events, and for evaluation, treatment and management of patients, particularly including those who develop vaccine-associated
disease. Identification of inborn errors of the Type 1 IFN response pathyway and / or auto-antibodies directed against, and particularly neutralizing, Type I IFNs are associated with severe
viral illness, including COVID-19
disease, and vaccine-associated disease, particularly with live attenuated
virus vaccines, particularly including
yellow fever vaccines, as well as arboviral diseases, including WNV and TSE
encephalitis.