HOUSTON, Nov. 30 (Xinhua) -- Eleven less U.S. States reported widespread A/H1N1 flu activity in the week ending Nov. 21, the Centers for Disease Control and Prevention (CDC) said on Monday.

    "Thirty-two states reported geographically widespread influenza activity, Puerto Rico and 17 states reported regional influenza activity, the District of Columbia and one state reported local influenza activity, and Guam and the U.S. Virgin Islands reported sporadic influenza activity." the CDC said on its website.

    Last week, the CDC said that 43 states had reported widespread influenza activity in the previous week ( Nov. 8-14), down from 46states in a week earlier, showing a continuous downtrend for two weeks running.

    "Visits to doctors for influenza-like illness (ILI) nationwide had also decreased sharply over previous week with all regions showing declines in ILI," the CDC said in its latest report.

    "This is the fourth consecutive week of national decreases in ILI after four consecutive weeks of sharp increases," the CDC added.

    The second wave of the A/H1N1 pandemic reached its height in the United States by the end of October when the CDC alarmed the nation that forty-eight states were having widespread flu activities when production delays continue to hamper distribution of the A/H1N1 flu vaccine across the country.

    The remarkable downtrend in the past three weeks has been causing some experts to talk about that the second wave of A/H1N1 pandemic had peaked.

    "The peak clearly has passed," said Ira Longini, a statistician at University of Washington in Seattle who advises the U.S. government on flu.

    Even CDC officials are considering the possibility, but in a more discreet way.

    "We are beginning to see some declines in influenza activity, but there is still a lot of influenza everywhere," Dr. Anne Schuchat, director of the National Center for Immunization and Respiratory Diseases at the CDC, told a press conference last week.

    However, Schuchat warned that "the level of influenza activity we're seeing right now remains high."

    "Even though we saw a little bit of a decrease this week, it is still higher than the peak activity in many years," she explained." If we look over influenza seasons in the past, there can be multiple opens and downs over the season."

    "Influenza season typically goes from December to May and nothing is typical about this year's influenza," she said. "We may have weeks and months of a lot of disease ahead of us," she warned the public.