Effect of contraceptive access on birth rate.


M. ENSERINK’S NEWS OF THE WEEK STORY “EXOTIC DISEASE OF FARM animals tests Europe’s responses” (8 February, p. 710) describes how bluetongue, a disease caused by a vector-borne orbivirus, has spread widely in ruminant livestock in Europe since 1999. Unlike Europe, which has only experienced bluetongue disease in the past few years, the United States and the… (More)
DOI: 10.1126/science.320.5878.873