Clinical presentation of SARS is nonspecific; the important clinical findings in West Nile virus infection are those associated with neurological complications.Rapid and accurate diagnosis of SARS and West Nile virus infection remains an important clinical challenge.Older adults are at higher risk of complications, including death from SARS and West Nile virus.At present, there is no effective therapy for these infections.Although efforts are under way, there are presently no effective vaccines for SARS or West Nile virus.