2011-2012 Influenza Season Week 1 ending January 7, 2012


2011-2012 Influenza Season Week 1 ending January 7, 2012


All data are preliminary and may change as more reports are received.

Synopsis:

During week 1 (January 1-7, 2012), influenza activity increased in the United States, but remains relatively low.

National and Regional Summary of Select Surveillance Components

HHS Surveillance Regions* Data for current week Data cumulative since October 2, 2011 (Week 40)
Out-patient ILI† % of respiratory specimens positive for flu‡ Number of jurisdictions reporting regional or widespread activity§ A (H3) 2009 H1N1 A(Subtyping not performed) B Pediatric Deaths
Nation Normal 3.4% 2 of 54 464 30 367 188 0
Region 1 Normal 2.2% 1 of 6 14 1 0 7 0
Region 2 Normal 0.5% 0 of 4 7 1 4 2 0
Region 3 Normal 0.7% 0 of 6 13 1 4 0 0
Region 4 Normal 3.7% 0 of 8 46 10 176 116 0
Region 5 Normal 9.0% 0 of 6 85 7 6 11 0
Region 6 Normal 1.1% 0 of 5 14 1 23 18 0
Region 7 Normal 4.9% 0 of 4 46 0 22 2 0
Region 8 Normal 7.9% 1 of 6 140 1 77 9 0
Region 9 Normal 5.4% 0 of 5 65 7 50 17 0
Region 10 Normal 2.6% 0 of 4 34 1 5 6 0
*HHS regions (Region 1 CT, ME, MA, NH, RI, VT; Region 2: NJ, NY, Puerto Rico, US Virgin Islands; Region 3: DE, DC, MD, PA, VA, WV; Region 4: AL, FL, GA, KY, MS, NC, SC, TN; Region 5: IL, IN, MI, MN, OH, WI; Region 6: AR, LA, NM, OK, TX; Region 7: IA, KS, MO, NE; Region 8: CO, MT, ND, SD, UT, WY; Region 9: AZ, CA, Guam, HI, NV; and Region 10: AK, ID, OR, WA). 
† Elevated means the % of visits for ILI is at or above the national or region-specific baseline 
‡ National data are for current week; regional data are for the most recent three weeks 
§ Includes all 50 states, the District of Columbia, Guam, Puerto Rico, and U.S. Virgin Islands 


U.S. Virologic Surveillance:

WHO and NREVSS collaborating laboratories located in all 50 states report to CDC the number of respiratory specimens tested for influenza and the number positive by influenza type and subtype. The results of tests performed during the current week are summarized in the table below.
Week 1
No. of specimens tested 3,199
No. of positive specimens (%) 108 (3.4%)
Positive specimens by type/subtype
  Influenza A 102 (94.4%)
             2009 H1N1 5 (4.9%) 
             Subtyping not performed 42 (41.2%) 
             (H3) 55 (53.9%) 
  Influenza B 6 (5.6%)


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This entry was posted in Guam, ILI, Infectious disease, influenza, Influenza-like illness, New York City, Puerto Rico, United States. Bookmark the permalink.

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