That echoes what Anne Schuchat, MD, the CDC's acting director for science and public health, said yesterday.
"I believe that virtually all the U.S. has this virus circulating. It does not mean everyone is infected, but within communities, it has arrived," Schuchat said at Sunday's news conference. "This virus has arrived in communities."
The CDC's official count is 286 confirmed cases in 36 states -- but Besser said there are 700 probable cases in 44 states, 99% of which will be confirmed. From now on, Besser said, the CDC will simply report probable cases, and focus more on slowing the spread of disease rather than on keeping up with what happened the day before.
The H1N1 swine flu remains a relatively mild illness for most people who come down with it. That's an encouraging sign, Besser said. Also encouraging is that the H1N1 swine flu epidemic in Mexico appears to be slowing down -- today, in fact, the Mexican government lowered its alert level to end its five-day closure of non-essential businesses.
And so far, the virus has not changed, making eventual vaccine success more likely -- if officials decide to go forward with a vaccine. Besser said that although vaccine preparation is moving full speed ahead, there's still time to decide whether to make an H1N1 swine flu vaccine, and whether the current strain will be the best to vaccinate against.
In one sense, it is. The new flu isn't as serious as the seasonal flu, which infects 30 million Americans every year and causes some 36,000 deaths.
But because it's a new flu virus, nobody knows what to expect. Nobody knows whether the H1N1 swine flu can keep smoldering throughout the spring and summer months -- or what will happen if it hits hard when flu season starts back up in the fall and winter.