A Comparison of the Effectiveness of Oseltamivir for the Treatment of Influenza A and Influenza B: A Japanese Multicenter Study of the 2003-2004 and 2004-2005 Influenza Seasons

Oseltamivir is less effective for influenza B than for influenza A with regard to duration of fever and virus persistence, irrespective of patient age or the timing of administration of the first dose.