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RESEARCH9. Centers for Disease Control and Prevention. Intrauterine West Nilevirus infection—New York, 2002. MMWR Morb Mortal WklyRep. 2002;51:1135–6.10. Centers for Disease Control and Prevention. Possible West Nilevirus transmission to an infant through breast-feeding—Michigan,2002. MMWR Morb Mortal Wkly Rep. 2002;51:877–8.11. Centers for Disease Control and Prevention. West Nile virus:statistics and maps [cited 2014 Aug 24]. http://www.cdc.gov/westnile/statsMaps/12. Centers for Disease Control and Prevention. Assessing capacityfor the surveillance, prevention, and control of West Nile virus—United States, 1999 and 2004. MMWR Morb Mortal Wkly Rep.2006;55:150–3.13. Centers for Disease Control and Prevention. West Nile virusand other arboviral diseases—United States, 2012. MMWRMorb Mortal Wkly Rep. 2013;62:513–7.14. Centers for Disease Control and Prevention. Locally acquireddengue—Key West, Florida, 2009–2010. MMWR Morb MortalWkly Rep. 2010;59:577–81.15. Ruiz-Moreno D, Vargas IS, Olson KE, Harrington LC. Modelingdynamic introduction of chikungunya virus in the United States.PLoS Negl Trop Dis. 2012;6:e1918.16. World Health Organization. Global alert and response.Chikungunya in the French part of the Caribbean isle of SaintMartin. 2013 Dec 10 [cited 2014 Aug 24]. http://www.who.int/csr/don/2013_12_10a/en/index.html17. Centers for Disease Control and Prevention. Chikungunya in theAmericas. Spread of the virus in the Americas. 2014 Apr 7 [cited2014 Aug 24]. http://www.cdc.gov/chikungunya/geo/americas.html18. Ebel GD. Update on Powassan virus: emergence of a NorthAmerican tick-borne flavivirus. Annu Rev Entomol. 2010;55:95–110. http://dx.doi.org/10.1146/annurev-ento-112408-08544619. Council of State and Territorial Epidemiologists. Assessment ofcapacity in 2012 for the surveillance, prevention and control ofWest Nile virus and other mosquito-borne virus infections in stateand large city/county health departments and how it compares to2004. February 2014 [cited 2014 Aug 24]. http://www.cste2.org/docs/VBR.pdf20. Centers for Disease Control and Prevention. West Nile virus in theUnited States: guidelines for surveillance, prevention, and control.4th revision. June 14, 2013 [cited 2014 Aug 24]. http://www.cdc.gov/westnile/resources/pdfs/wnvGuidelines.pdf21. Centers for Disease Control and Prevention. Epi Info. 2013 Apr[cited 2014 Aug 24]. https://wwwn.cdc.gov/epiinfo/user-guide/survey/introduction.html22. United States Geological Survey. Dengue fever (imported, locallyacquired)—human, 2013. 2014 Jan [cited 2014 Aug 24].http://diseasemaps.usgs.gov/del_us_human.htmlAddress for correspondence: James L. Hadler, Emerging InfectionsProgram, Yale School of Public Health, 1 Church St, 7th Fl, New Haven,CT 06510, USA; emails: hadler-epi@att.net or hadlerepi@gmail.comApril 2015: Emerging VirusesIncluding:• Reappearance of Chikungunya, Formerly Called Dengue, in the Americas• Hantavirus Pulmonary Syndrome, Southern Chile, 1995–2012• Animal-Associated Exposure to Rabies Virus among Travelers, 1997–2012• Evolution of Ebola Virus Disease from Exotic Infection to Global Health Priority,Liberia, Mid-2014• Population Structure and Antimicrobial Resistance of Invasive Serotype IV Group BStreptococcus, Toronto, Ontario, Canada• Norovirus Genotype Profiles Associated with Foodborne Transmission,1999–2012• Deaths Associated with Respiratory Syncytial and Influenza Viruses among Persons>5 Years of Age in HIV-Prevalent Area, South Africa• Sequence Variability and Geographic Distribution of Lassa Virus, Sierra Leone• Influenza A(H7N9) Virus Transmission between Finches and Poultry• Highly Pathogenic Avian Influenza A(H5N1) Virus Infection among Workers at LiveBird Markets, Bangladesh, 2009–2010• Increased Risk for Group B Streptococcus Sepsis in Young Infants Exposed to HIV,Soweto, South Africa, 2004–2008http://wwwnc.cdc.gov/eid/articles/issue/21/4/table-of-contents1166 Emerging Infectious Diseases • www.cdc.gov/eid • Vol. 21, No. 7, July 2015