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Olfactory bulb to plasma ratio (OB/plasma ratio) after nasal administration of the same dose of ribavirin (1 mg) by intravenous injection (grey bar) or nasal administration of ribavirin agglomerates with α-cyclodextrin excipient microparticles (black bar) (n = 6, average ± SEM). Data for the intravenous administration are according to Colombo et al., 2011.
