Past Weekly Surveillance Reports

Information about the 2009 H1N1 pandemic is archived and available at http://www.cdc.gov/h1n1flu/.

Years	Report for the week ending
2012 - 2013	Current Weekly Influenza Report Feb 23, 2013—Week 8 Feb 16, 2013—Week 7 Feb 9, 2013—Week 6 Feb 2, 2013—Week 5 Jan 26, 2013—Week 4 Jan 19, 2013—Week 3 Jan 12, 2013—Week 2 Jan 5, 2013—Week 1 Dec 29, 2012—Week 52 Dec 22, 2012—Week 51 Dec 15, 2012—Week 50 Dec 8, 2012—Week 49 Dec 1, 2012—Week 48 Nov 24, 2012—Week 47 Nov 17, 2012—Week 46 Nov 10, 2012—Week 45 Nov 3, 2012—Week 44 Oct 27, 2012—Week 43 Oct 20, 2012—Week 42 Oct 13, 2012—Week 41 Oct 6, 2012—Week 40
2011 - 2012	Sep 29, 2012—Week 39 Sep 22, 2012—Week 38 Sep 15, 2012—Week 37 Sep 8, 2012—Week 36 Sep 1, 2012—Week 35 Aug 25, 2012—Week 34 Aug 18, 2012—Week 33 Aug 11, 2012—Week 32 Aug 4, 2012—Week 31 Jul 28, 2012—Week 30 Jul 21, 2012—Week 29 Jul 14, 2012—Week 28 Jul 7, 2012—Week 27 Jun 30, 2012—Week 26 Jun 23, 2012—Week 25 Jun 16, 2012—Week 24 Jun 9, 2012—Week 23 Jun 2, 2012—Week 22 May 26, 2012—Week 21 May 19, 2012—Week 20 May 12, 2012—Week 19 May 5, 2012—Week 18 Apr 28, 2012—Week 17 Apr 21, 2012—Week 16 Apr 14, 2012—Week 15 Apr 7, 2012—Week 14 Mar 31, 2012—Week 13 Mar 24, 2012—Week 12 Mar 17, 2012—Week 11 Mar 10, 2012—Week 10 Mar 3, 2012—Week 9 Feb 25, 2012—Week 8 Feb 18, 2012—Week 7 Feb 11, 2012—Week 6 Feb 4, 2012—Week 5 Jan 28, 2012—Week 4 Jan 21, 2012—Week 3 Jan 14, 2012—Week 2 Jan 7, 2012—Week 1 Dec 31, 2012—Week 52 Dec 24, 2011—Week 51 Dec 17, 2011—Week 50 Dec 10, 2011—Week 49 Dec 3, 2011—Week 48 Nov 26, 2011—Week 47 Nov 19, 2011—Week 46 Nov 12, 2011—Week 45 Nov 5, 2011—Week 44 Oct 29, 2011—Week 43 Oct 22, 2011—Week 42 Oct 15, 2011—Week 41 Oct 8, 2011—Week 40
2010 - 2011	2010-11 Influenza Season Summary Oct 1, 2011—Week 39 Sept 24, 2011—Week 38 Sept 17, 2011—Week 37 Sept 10, 2011—Week 36 Sept 3, 2011—Week 35 Aug 27, 2011—Week 34 Aug 20, 2011—Week 33 Aug 13, 2011—Week 32 Aug 6, 2011—Week 31 July 30, 2011—Week 30 July 23, 2011—Week 29 July 16, 2011—Week 28 July 9, 2011—Week 27 July 2, 2011—Week 26 June 25, 2011—Week 25 June 18, 2011—Week 24 June 11, 2011—Week 23 June 4, 2011—Week 22 May 28, 2011—Week 21 May 21, 2011—Week 20 May 14, 2011—Week 19 May 7, 2011—Week 18 Apr 30, 2011—Week 17 Apr 23, 2011—Week 16 Apr 16, 2011—Week 15 Apr 9, 2011—Week 14 Apr 2, 2011—Week 13 Mar 26, 2011—Week 12 Mar 19, 2011—Week 11 Mar 12, 2011—Week 10 Mar 5, 2011—Week 9 Feb 26, 2011—Week 8 Feb 19, 2011—Week 7 Feb 12, 2011—Week 6 Feb 5, 2011—Week 5 Jan 29, 2011—Week 4 Jan 22, 2011—Week 3 Jan 15, 2011—Week 2 Jan 8, 2011—Week 1 Jan 1, 2011—Week 52 Dec 24, 2010—Week 51 Dec 18, 2010—Week 50 Dec 11, 2010—Week 49 Dec 4, 2010—Week 48 Nov 27, 2010—Week 47 Nov 20, 2010—Week 46 Nov 13, 2010—Week 45 Nov 6, 2010—Week 44 Oct 30, 2010—Week 43 Oct 23, 2010—Week 42 Oct 16, 2010—Week 41 Oct 9, 2010—Week 40
2009 - 2010	2009-10 Influenza Season Summary May 23, 2010—Week 20 May 16, 2010—Week 19 May 9, 2010—Week 18 May 2, 2010—Week 17 Apr 25, 2010—Week 16 Apr 18, 2010—Week 15 Apr 11, 2010—Week 14 Apr 4, 2010—Week 13 Mar 28, 2010—Week 12 Mar 21, 2010—Week 11 Mar 14, 2010—Week 10 Mar 7, 2010—Week 09 Feb 28, 2010—Week 08 Feb 21, 2010—Week 07 Feb 14, 2010—Week 06 Feb 7, 2010—Week 05 Jan 31, 2010—Week 04 Jan 24, 2010—Week 03 Jan 17, 2010—Week 02 Jan 10, 2010—Week 01 Jan 3, 2010—Week 52 Dec 26, 2009—Week 51 Dec 19, 2009—Week 50 Dec 12, 2009—Week 49 Dec 5, 2009—Week 48 Nov 28, 2009—Week 47 Nov 21, 2009—Week 46 Nov 14, 2009—Week 45 Nov 7, 2009—Week 44 Oct 31, 2009—Week 43 Oct 24, 2009—Week 42 Oct 17, 2009—Week 41 Oct 10, 2009—Week 40
2008 - 2009	2008-09 Influenza Season Summary Oct 3, 2009—Week 39 Sep 26, 2009—Week 38 Sep 19, 2009—Week 37 Sep 12, 2009—Week 36 Sep 5, 2009—Week 35 Aug 29, 2009—Week 34 Aug 22, 2009—Week 33 Aug 15, 2009—Week 32 Aug 8, 2009—Week 31 Aug 1, 2009—Week 30 Jul 25, 2009—Week 29 Jul 18, 2009—Week 28 Jul 11, 2009—Week 27 Jul 4, 2009—Week 26 Jun 27, 2009—Week 25 Jun 20, 2009—Week 24 Jun 13, 2009—Week 23 Jun 6, 2009—Week 22 May 30, 2009—Week 21 May 23, 2009—Week 20 May 16, 2009—Week 19 May 9, 2009—Week 18 May 2, 2009—Week 17 April 18, 2009—Week 15 April 11, 2009—Week 14 April 4, 2009—Week 13 March 28, 2009—Week 12 March 21, 2009—Week 11 March 14, 2009—Week 10 March 7, 2009—Week 09 February 28, 2009—Week 08 February 21, 2009—Week 07 February 14, 2009—Week 06 February 7, 2009—Week 05 January 31, 2009—Week 04 January 24, 2009—Week 03 January 17, 2009—Week 02 January 10, 2009—Week 01 January 3, 2009—Week 53 December 27, 2008—Week 52 December 20, 2008—Week 51 December 13, 2008—Week 50 December 6, 2008—Week 49 November 29, 2008—Week 48 November 22, 2008—Week 47 November 15, 2008—Week 46 November 8, 2008—Week 45 November 1, 2008—Week 44 October 25, 2008—Week 43 October 18, 2008—Week 42 October 11, 2008—Week 41 October 4, 2008—Week 40
2007 - 2008*	2007-08 Influenza Season Summary May 17, 2008—Week 20 May 10, 2008—Week 19 May 3, 2008—Week 18 April 26, 2008—Week 17 April 19, 2008—Week 16 April 12, 2008—Week 15 April 5, 2008—Week 14 March 29, 2008—Week 13 March 22, 2008—Week 12 March 15, 2008—Week 11 March 8, 2008—Week 10 March 1, 2008—Week 9 February 23, 2008—Week 8 February 16, 2008—Week 7 February 9, 2008—Week 6 February 2, 2008—Week 5 January 26, 2008—Week 4 January 19, 2008—Week 3 January 12, 2008—Week 2 January 5, 2008—Week 1 December 29, 2007—Week 52 December 22, 2007—Week 51 December 15, 2007—Week 50 December 8, 2007—Week 49 December 1, 2007—Week 48 November 24, 2007—Week 47 November 17, 2007—Week 46 November 10, 2007—Week 45 November 3, 2007—Week 44 October 27, 2007—Week 43 October 20, 2007—Week 42 October 13, 2007—Week 41 October 6, 2007—Week 40
2006 - 2007	2006-07 Influenza Season Summary May 19, 2007—Week 20 May 12, 2007—Week 19 May 5, 2007—Week 18 April 28, 2007—Week 17 April 21, 2007—Week 16 April 14, 2007—Week 15 April 7, 2007—Week 14 March 31, 2007—Week 13 March 24, 2007—Week 12 March 17, 2007—Week 11 March 10, 2007—Week 10 March 3, 2007—Week 9 February 24, 2007—Week 8 February 17, 2007—Week 7 February 10, 2007—Week 6 February 3, 2007—Week 5 January 27, 2007—Week 4 January 20, 2007—Week 3 January 13, 2007—Week 2 January 6, 2007—Week 1 December 30, 2006—Week 52 December 23, 2006—Week 51 December 16, 2006—Week 50 December 9, 2006—Week 49 December 2, 2006—Week 48 November 25, 2006—Week 47 November 18, 2006—Week 46 November 11, 2006—Week 45 November 4, 2006—Week 44 October 28, 2006—Week 43 October 21, 2006—Week 42 October 14, 2006—Week 41 October 7, 2006—Week 40
2005 - 2006	2005-06 Influenza Season Summary May 20, 2006—Week 20 May 13, 2006—Week 19 May 6, 2006—Week 18 April 29, 2006—Week 17 April 22, 2006—Week 16 April 15, 2006—Week 15 April 8, 2006—Week 14 April 1, 2006—Week 13 March 25, 2006—Week 12 March 18, 2006—Week 11 March 11, 2006—Week 10 March 4, 2006—Week 9 February 25, 2006—Week 8 February 18, 2006—Week 7 February 11, 2006—Week 6 February 4, 2006—Week 5 January 28, 2006—Week 4 January 21, 2006—Week 3 January 14, 2006—Week 2 January 7, 2006—Week 1 December 31, 2005—Week 52 December 24, 2005—Week 51 December 17, 2005—Week 50 December 10, 2005—Week 49 December 3, 2005—Week 48 November 26, 2005—Week 47 November 19, 2005—Week 46 November 12, 2005—Week 45 November 5, 2005—Week 44 October 29, 2005—Week 43 October 22, 2005—Week 42 October 15, 2005—Week 41 October 8, 2005—Week 40
2004 - 2005	2004-05 Influenza Season Summary May 21, 2005—Week 20 May 14, 2005—Week 19 May 7, 2005—Week 18 April 30, 2005—Week 17 April 23, 2005—Week 16 April 16, 2005—Week 15 April 9, 2005—Week 14 April 2, 2005—Week 13 March 26, 2005—Week 12 March 19, 2005—Week 11 March 12, 2005—Week 10 March 5, 2005—Week 9 February 26, 2005—Week 8 February 19, 2005—Week 7 February 12, 2005—Week 6 February 5, 2005—Week 5 January 29, 2005—Week 4 January 22, 2005—Week 3 January 15, 2005—Week 2 January 8, 2005—Week 1 January 1, 2005—Week 52 December 25, 2004—Week 51 December 18, 2004—Week 50 December 11, 2004—Week 49 December 4, 2004—Week 48 November 27, 2004—Week 47 November 20, 2004—Week 46 November 13, 2004—Week 45 November 6, 2004—Week 44 October 30, 2004—Week 43 October 23, 2004—Week 42 October 16, 2004—Week 41 October 9, 2004—Week 40
2003 - 2004	2003-04 Influenza Season Summary May 22, 2004—Week 20 May 15, 2004—Week 19 May 8, 2004—Week 18 May 1, 2004—Week 17 April 24, 2004—Week 16 April 17, 2004—Week 15 April 10, 2004—Week 14 April 3, 2004—Week 13 March 27, 2004—Week 12 March 20, 2004—Week 11 March 13, 2004—Week 10 March 6, 2004—Week 9 February 28, 2004—Week 8 February 21, 2004—Week 7 February 14, 2004—Week 6 February 7, 2004—Week 5 January 31, 2004—Week 4 January 24, 2004—Week 3 January 17, 2004—Week 2 January 10, 2004—Week 1 January 3, 2004—Week 53 December 27, 2003—Week 52 December 20, 2003—Week 51 December 13, 2003—Week 50 December 6, 2003—Week 49 November 29, 2003—Week 48 November 22, 2003—Week 47 November 15, 2003—Week 46 November 8, 2003—Week 45 November 1, 2003—Week 44 October 25, 2003—Week 43 October 18, 2003—Week 42 October 11, 2003—Week 41 October 4, 2003—Week 40
2002 - 2003	2002-03 Influenza Season Summary May 17, 2003—Week 20 May 10, 2003—Week 19 May 3, 2003—Week 18 April 26, 2003—Week 17 April 19, 2003—Week 16 April 12, 2003—Week 15 April 5, 2003—Week 14 March 29, 2003—Week 13 March 22, 2003—Week 12 March 15, 2003—Week 11 March 8, 2003—Week 10 March 1, 2003—Week 9 February 22, 2003—Week 8 February 15, 2003—Week 7 February 8, 2003—Week 6 February 1, 2003—Week 5 January 25, 2003—Week 4 January 18, 2003—Week 3 January 11, 2003—Week 2 January 4, 2003—Week 1 December 28, 2002—Week 52 December 21, 2002—Week 51 December 14, 2002—Week 50 December 7, 2002—Week 49 November 30, 2002—Week 48 November 23, 2002—Week 47 November 16, 2002—Week 46 November 9, 2002—Week 45 November 2, 2002—Week 44 October 26, 2002—Week 43 October 19, 2002—Week 42 October 12, 2002—Week 41 October 5, 2002—Week 40
2001 - 2002	2001-02 Influenza Season Summary May 18, 2002—Week 20 May 11, 2002—Week 19 May 4, 2002—Week 18 April 27, 2002—Week 17 April 20, 2002—Week 16 April 13, 2002—Week 15 April 6, 2002—Week 14 March 30, 2002—Week 13 March 23, 2002—Week 12 March 16, 2002—Week 11 March 9, 2002—Week 10 March 2, 2002—Week 9 February 23, 2002—Week 8 February 16, 2002—Week 7 February 9, 2002—Week 6 February 2, 2002—Week 5 January 26, 2002—Week 4 January 19, 2002—Week 3 January 12, 2002—Week 2 January 5, 2002—Week 1 December 29, 2001—Week 52 December 22, 2001—Week 51 December 15, 2001—Week 50 December 8, 2001—Week 49 December 1, 2001—Week 48 November 24, 2001—Week 47 November 17, 2001—Week 46 November 10, 2001—Week 45 November 3, 2001—Week 44 October 27, 2001—Week 43 October 20, 2001—Week 42 October 13, 2001—Week 41 October 6, 2001—Week 40
2000 - 2001	2000-01 Influenza Season Summary May 19, 2001—Week 20 May 12, 2001—Week 19 May 5, 2001—Week 18 April 28, 2001—Week 17 April 21, 2001—Week 16 April 14, 2001—Week 15 April 7, 2001—Week 14 March 31, 2001—Week 13 March 24, 2001—Week 12 March 17, 2001—Week 11 March 10, 2001—Week 10 March 3, 2001—Week 9 February 24, 2001—Week 8 February 17, 2001—Week 7 February 10, 2001—Week 6 February 3, 2001—Week 5 January 27, 2001—Week 4 January 20, 2001—Week 3 January 13, 2001—Week 2 January 6, 2001—Week 1 December 30, 2000—Week 52 December 23, 2000—Week 51 December 16, 2000—Week 50 December 9, 2000—Week 49 December 2, 2000—Week 48 November 25, 2000—Week 47 November 18, 2000—Week 46 November 11, 2000—Week 45 November 4, 2000—Week 44 October 28, 2000—Week 43 October 21, 2000—Week 42 October 14, 2000—Week 41 October 7, 2000—Week 40
1999 - 2000	1999-00 Influenza Season Summary May 20, 2000—Week 20 May 6, 2000—Week 18 April 22, 2000—Week 16 April 15, 2000—Week 15 April 8, 2000—Week 14 April 1, 2000—Week 13 March 25, 2000—Week 12 March 18, 2000—Week 11 March 11, 2000—Week 10 March 4, 2000—Week 9 February 26, 2000—Week 8 February 19, 2000—Week 7 February 12, 2000—Week 6 February 5, 2000—Week 5 January 29, 2000—Week 4 January 22, 2000—Week 3 January 15, 2000—Week 2 January 8, 2000—Week 1 January 1, 2000—Weeks 51 and 52 December 18, 1999—Week 50 December 11, 1999—Week 49 December 4, 1999—Week 48 November 27, 1999—Week 47 November 20, 1999—Week 46 November 13, 1999—Week 45 November 6, 1999—Week 44 October 30, 1999—Week 43 October 23, 1999—Week 42 October 16, 1999—Week 41 October 9, 1999—Week 40
Previous Years	United States Surveillance Data: 1997 - 1998 through 2007 - 2008 Seasons

*Pediatric influenza hospitalization data for the 2007-2008 season from one site in the New Vaccine Surveillance Network (NVSN) contained errors. The data were reanalyzed and updated results were posted in the May 17, 2008, week 20 report. Other influenza surveillance systems are unaffected.