Racism and mental health into the 21st century: perspectives and parameters.

Definitions and theories of racism are reviewed, and the influence of racism on the American mental health system is examined, with special attention to the effects on racial and ethnic minorities of the sociopolitical climate of the 1990s. The aims of this special section are outlined and an overview is presented of the articles, which define some of the key problems of racism and mental health, describe their scope and effects, and propose approaches to remediation as we move into the 21st century.

Landscape ecology of arboviruses in southeastern California: temporal and spatial patterns of enzootic activity in Imperial Valley, 1991-1994.

Western equine encephalomyelitis (WEE) and St. Louis encephalitis (SLE) viruses were detected in the Imperial Valley during the summers of 1991-1994 by isolation from the primary vector, Culex tarsalis Coquillett, and by the seroconversion of sentinel chickens. Enzootic transmission consistently was not detected first each year at sampling sites near specific landscape features such as a heron rookery and other riparian habitats along the New River, sites along the Mexican border, or saline and freshwater marshes along the southern shore of the Salton Sea. Despite mild winter temperatures and the elevated vernal abundance of Cx. tarsalis, WEE and SLE activity was not detected until June or July, indicating considerable amplification may be necessary before detection by testing mosquito pools for virus infection or sentinel chicken sera for antibodies. Results did not permit the spatial focusing of early season control efforts or research on mechanisms of virus interseasonal persistence.