| the emergence of west nile virus in north america: ecology, epidemiology, and surveillance. | in late summer 1999, the first domestically acquired human cases of wn encephalitis were documented in the usa. aggressive vector-control and public education efforts by state and local public health officials limited the extent of human involvement. the discovery of virus-infected, overwintering mosquitoes during the winter of 1999-2000, predicted renewed virus activity for the following spring, and prompted early season vector-control activities and disease surveillance efforts in nyc and the ... | 2002 | 12082991 |