Malaria surveillance in low-transmission areas of Zambia using reactive case detection

David A. Larsen, Zunda Chisha, Benjamin Winters, Mercie Mwanza, Mulakwa Kamuliwo, Clara Mbwili, Moonga Hawela, Busiku Hamainza, Jacob Chirwa, Allen S. Craig, Marie Reine Rutagwera, Chris Lungu, Tokozile Ngwenya-Kangombe, Sanford Cheelo, John M. Miller, Daniel J. Bridges, Anna M. Winters