Probable non-vector-borne transmission of Zika virus, Colorado, USA.Emerg Infect Dis. 2011 May; 17(5):880-2.EI
Clinical and serologic evidence indicate that 2 American scientists contracted Zika virus infections while working in Senegal in 2008. One of the scientists transmitted this arbovirus to his wife after his return home. Direct contact is implicated as the transmission route, most likely as a sexually transmitted infection.