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Virus shedding of MERS-CoV from 3 infected alpacas as detected from the deep nasal swab samples by day after initial infection and reinfection. Viral load was estimated from real-time cycle threshold values and a calibration experiment. Arrow indicates day 21, when the animals were reinfected with MERS-CoV. MERS-COV, Middle East respiratory syndrome coronavirus; TCID, tissue culture infective dose.
