Flu levels continue to be high in New York and New England, and especially in Massachusetts, the C.D.C. said.
Flu levels in the city are nearly twice the norm for this time of year, down from 10 to 12 times higher than usual in late May.
Figures from PHE showed flu levels are now higher than the peak for the last three winters, although they have not reached the levels seen in the winters of 2010/11 and 2008/09.
Also, the ads will only be delivered to mothers within two miles of retailers that carry the thermometer, including Walmart, Target and Babies "R" Us. "Flu levels in your area are high," says the banner ad within an app.
It's similar in theory to Google's Flu Maps feature, which maps flu levels across 121 cities in the U.S.
As it turns out, after an early spike in flu levels last October, the country is experiencing a relatively low level of outbreaks overall.
Today, it launched a more detailed view which maps flu levels across 121 cities in the U.S., including New York City, San Francisco, and Minneapolis.
"We are indeed seeing unseasonably high estimates of flu activity for the U.S. That's not because of more US data – it means that compared to the U.S. historical baseline, flu levels are "high".
Drug stocks also continued to rise after the World Health Organization raised its pandemic alert for swine flu to level 4 from level 3, increasing fears that the spreading outbreak could disrupt commerce and economic recovery in some countries.
Humiliating defeat for Brown forces rethink over Gurkhas Financial Times: Brown in surprise defeat on Gurkha's rights Guardian: Gurkha's undaunted, Brown defeated SWINE FLU THREAT LEVEL RISES The World Health Organisation raised its swine flu global pandemic threat level to phase five overnight, indicating the disease can spread easily between humans; a strong signal that a pandemic is imminent.
