So far 37 flu-related deaths in children have been confirmed across the U.S. since Oct. 1, according to the Centers for Disease Control and Prevention (CDC). New York, Puerto Rico and 39 other states are experiencing high activity of influenza-like illness, according to the CDC's most recent activity report.
![\"PHOTO:](\"http://a.abcnews.com/images/Health/flu-visits-chart-ap-jt-180126_15x16_384.jpg\")
AP
PHOTO: Chart showing weekly percentage of visits for flu-like illness reported by ILINet by season, highlighting the past three seasons.
Nearly 10 school districts in Oklahoma have canceled classes for one to two days because of the large number of flu-related student absences, ABC Oklahoma City affiliate KOCO-TV reported.
Meanwhile, as schools and families struggle to fight the flu, the most well-known antiviral treatment -- Tamiflu -- is in short supply.
\"We're told that it was on back order,\" Marissa Sgambati, a Florida woman in search of Tamiflu for her daughter, told ABC Orlando affiliate WFTV-TV. \"It was just very challenging.\"
Walgreens, the national drugstore chain, told ABC News the sudden surge in demand for Tamiflu means some versions of the medication, or some dosages, may be unavailable. The company also said it expects more inventory to arrive in the coming days.
![\"PHOTO:](\"http://a.abcnews.com/images/Health/tamiflu-rt-jt-180126_16x11_384.jpg\")
Fred Prouser/Reuters, FILE
PHOTO: Four capules of Tamiflu are pictured on a Tamiflu box in Burbank, Calif., Jan. 31, 2013.
Tamiflu, and its generic version, oseltamivir, are \"modestly effective\" at treating the flu but more effective when used to help prevent the flu, according to ABC News chief medical correspondent Dr. Jennifer Ashton.
Ashton said it is simply \"not feasible\" to expect everyone to take Tamiflu for the entire flu season, which runs from October to around May.
People at higher risk for complications from influenza – such as those younger than 5 (especially younger than 2) or older than 65, pregnant woman and people with pre-existing conditions – are recommended for an antiviral treatment for prevention of flu, according to the CDC.
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