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954 MMWR September 4, 2009 surveillance, including timely reporting of laboratory results, cell disease is inherited in an autosomal recessive pattern. A to minimize the risk for and effects of WPV importations. person with one copy of the mutated gene for hemoglobin is commonly referred to as having sickle cell trait. The trait typi- Acknowledgment cally is asymptomatic, and persons with the trait commonly are This report is based, in part, on contributions by staff members unaware of their carrier status. However, these persons might of GPLN laboratories. pass the gene on to their children. Currently, no data system References exists that can be used to determine the actual prevalence of 1. CDC. Laboratory surveillance for wild and vaccine-derived polioviruses— sickle cell disease in the United States. CDC, in partnership worldwide, January 2007–June 2008. MMWR 2008;57:967–70. 2. CDC. Apparent global interruption of wild poliovirus type 2 transmission. with the National Institutes of Health, is working to develop a MMWR 2001;50:222–4. pilot surveillance system that will help determine more about 3. CDC. Wild poliovirus type 1 and type 3 importations—15 countries, how many persons have the disease and how it affects them. Africa, 2008–2009. MMWR 2009;58:357–62. 4. CDC. Update on vaccine-derived polioviruses—worldwide, January September is Sickle Cell Awareness Month. In recognition, 2006–June 2007. MMWR 2007;56:996–1001. CDC is sponsoring activities to increase knowledge and aware- 5. Kilpatrick DR, Yang C-F, Ching K, et al. Rapid group-, serotype-, and ness of the disease, including a symposium on September 21, vaccine strain-specific identification of pol
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