Is the swine flu pandemic over in the United States? Federal health officials won't say so, but on Friday they reported that, for the fourth week running, no state had widespread flu activity.
Cases in the US have been falling steadily since October. The Centers for Disease Control and Prevention says swine flu cases are still occurring and will continue at the same pace for a while, but experts say another wave in the future looks unlikely.
An estimated 70 million Americans were vaccinated against swine flu during the national vaccination campaign that began in October. At the same time, an estimated 55 million or more caught the illness and recovered, so they have developed their own immunity.
Taken together, about 40% of the population is immune to the virus, figures that make it hard for swine flu to come back in a new wave.
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