7Van den Hof S, Meffre CM, Conyn -van speandonck MA, et al. Measles outbreak in a community with very low vaccine coverage, the Netherlands. Emerg Infect Dis ,2001,7:593 - 597.
8Parker AA, Staggs W, Dayan GH, et al. Implications of a 2005 measles outbreak in indiana for sustained elimination of measle in the United States. N Engl J Med,2006 ,355: 447 -455.