Forty one states are now identifying widespread disease from influenza. That's up from 37 last week.

"It's unprecedented to for this time of year to have the whole country seeing such high levels of activity," Dr. Anne Schuchat of the Centers for Disease Control and Prevention said.

The government says H1N1 vaccine production and distribution has fallen behind.

"Eventually, anyone who wants to be vaccinated will be able to be vaccinated, but the next couple of weeks will continue to be a slow start," Schuchat added.

It's disappointing news to U.S. health officials, who had hoped to have some 40 million vaccine doses ready by the end of October.

Instead, around 28 to 30 million doses will be available. That will make it harder for states and large cities to start scheduling mass vaccination clinics.

Since August 30 there have been 43 reports of pediatric deaths from influenza, according to the CDC.