The week after the switchover, the number of fresh cases fell significantly, with a best estimate of 30,000 new cases, down by two-thirds from the previous week.

• 这种改变很可能帮助了减慢猪流感的传播。转变后的第一周，新增病例就大幅下降，据估计最多只有3,000例，较前一周减少了三分之二。