One definite and one probable isolation of western equine encephalomyelitis (WEE) virus are reported from whole blood and serum, respectively, of apparently normal, immature English sparrows (Passer domesticus domesticus) trapped in southern New Jersey in September, 1953. Neutralizing substance against WEE virus was found in 12 of 88 plasma specimens obtained from domesticated birds reared in the same general area. In the WEE antibody survey the high proportion (9 of 13) of positive tests among 2-year-old birds and the low proportion (3 of 19) among immature birds in the same flock suggest that infection may have occurred both in 1952 and 1953.