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(a, b) Viraemia profiles of HOSPs (n = 6; except for WN/IC-P991 where n = 5) following inoculation with 1500 p.f.u. NY99/MX03 parental genotype and point-mutant viruses. Daily mean peak titres are represented (±sd) with a detection limit of 1.7 log10 p.f.u. (ml serum)−1. WN/IC-P991 and WN-MX03/IC have been displayed on both graphs for comparative purposes.
