US data shows that the 2009 A/H1N1 flu virus has become the dominant flu virus causing influenza-like-illness (ILI) ILI report rates have increased over the seasonal pattern, with a possibility of higher escalation recently after week 33.
Clearly the H1N1 flu has caused a new spike in ILI (purple bars) over the summer months, way over the usual seasonal pattern (green bars).
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