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Challenge testing of 2 norovirus-negative macaques with GII.17 norovirus. A, B) Challenged macaques shed norovirus-specific RNA (genome copies) for at least 16 days; shedding peaked on postinoculation day 3. C, D) Serum norovirus antibody titers before (postinoculation day 1) and after (postinoculation day 7–35) challenge.
