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California 2011-2012 Flu Season: FINAL REPORT

Re: California 2011-2012 Flu Season: Weeks 40-10 (One Pediatric, One Adult Death; Total 11)

Re: California 2011-2012 Flu Season: Weeks 40-10 (One Pediatric, One Adult Death; Total 11)

Week 10: Widespread
1 pediatric (under 5 years), 1 adult (51-64 years) death reported; total 11

CDPH received six reports of laboratory-confirmed influenza outbreaks in week 10; all at congregate living facilities. Four were associated with influenza A (H3) and occurred in the southern and San Francisco bay area regions and two were associated with influenza A (2009 H1N1) and occurred in the San Francisco bay area region.

Outpatient influenza-like illness (ILI) was down 0.5% in week 10 (3.1%) compared to week 9 (3.6%).

Of 1865 specimens tested during week 10, 509 (27.3%) were positive for influenza; of these 73 (14.3%) were influenza B and 436 (85.7%) were influenza A. 102 (23.4%) were subtyped as seasonal A (H3), 46 (10.6%) were subtyped as 2009 A (H1), and 288 (66.1%) were not subtyped.

No resistance to neuraminidase inhibitors has been identified in 60 influenza isolates tested during the 2011-2012 influenza season.

Eighty-two specimens from California residents have been strain-typed this season; all but eight influenza B strains match the 2011-12 influenza vaccine.
http://www.cdph.ca.gov/HealthInfo/discond/Pages/Influenza(Flu).aspx
 
Re: California 2011-2012 Flu Season: Weeks 40-11 (One New Adult Death; Total 12)

Re: California 2011-2012 Flu Season: Weeks 40-11 (One New Adult Death; Total 12)

Week 11: Widespread
1 new adult death; total 12 (3 were among children 0-17 years and 9 were among adults 18-64 years)

ILI: 2.8%
34.3% positive for influenza
CDPH received 11 reports of laboratory-confirmed influenza outbreaks in week 11; 1 was in a school, 2 were in jails and 8 were in congregate living facilities. Of the 11 outbreaks, 9 were associated with influenza A (H3) and 2 were associated with influenza A (subtyping not done).
http://www.cdph.ca.gov/HealthInfo/discond/Pages/Influenza(Flu).aspx
 
Re: California 2011-2012 Flu Season: Weeks 40-12 (Two New Adult Death; Total 14)

Re: California 2011-2012 Flu Season: Weeks 40-12 (Two New Adult Death; Total 14)

Week 12: Widespread
2 new adult deaths (25-49 years); total 14

CDPH received six reports of laboratory-confirmed influenza outbreaks in week 12; one was in a school and five were in congregate living facilities. Of the six outbreaks, 2 were associated with influenza A (H3) and 4 were associated with influenza A (subtyping not done).

Outpatient influenza-like illness (ILI) was up 0.3% in week 12 (3.1%) compared to week 11 (2.8%).

Of 2296 specimens tested during week 12, 28.1% were positive for influenza; of these 17.3% were influenza B and 82.7% were influenza A, 5.4% were subtyped as 2009 A (H1), 20.8% were subtyped as seasonal A (H3), and 73.8% were not subtyped.

No resistance to neuraminidase inhibitors has been identified in 78 influenza isolates tested during the 2011-2012 influenza season.

Eighty-two specimens from California residents have been strain-typed this season; all but eight influenza B strains match the 2011-12 influenza vaccine.
http://www.cdph.ca.gov/HealthInfo/discond/Pages/Influenza(Flu).aspx
 
Re: California 2011-2012 Flu Season: Weeks 40-13 (Six New Deaths; Total 20)

Re: California 2011-2012 Flu Season: Weeks 40-13 (Six New Deaths; Total 20)

Week 13: Widespread
6 new deaths ( one was in a child age 0-4 years and 5 were in adults age 29-58 years); total 20 To date during the 2011-2012 influenza season, CDPH has received 20 reports of influenza-associated deaths among persons less than 65 years old; 4 were among children 0-17 years and 16 were among adults 18-64.

CDPH received four reports of laboratory-confirmed influenza outbreaks in week 13; two were in schools and two were in congregate living facilities. Of the four outbreaks, one was associated with influenza A (H3), one was associated with influenza A where subtyping was not performed and two were associated with influenza where the type was not provided.

ILI: 3.1%
32.4% positive for influenza: 24.0% were influenza B and 76.0% were influenza A.
http://www.cdph.ca.gov/HealthInfo/discond/Pages/Influenza(Flu).aspx
 
Re: California 2011-2012 Flu Season: Weeks 40-14 (No New Deaths; Total 20)

Re: California 2011-2012 Flu Season: Weeks 40-14 (No New Deaths; Total 20)

Week 14: Widespread
No new deaths; total 20
CDPH received six reports of laboratory-confirmed influenza outbreaks in week 14; three were in congregate living facilities and one each in a prison, a daycare and a hospital. Of the six outbreaks, one was associated with influenza A (2009 H1N1), two were associated with influenza A (H3) and three were associated with influenza A where subtyping was not performed.

ILI: 2.2%
30.5% positive for influenza
http://www.cdph.ca.gov/HealthInfo/discond/Pages/Influenza(Flu).aspx
 
Re: California 2011-2012 Flu Season: Weeks 40-15 (Six New Deaths; Total 26)

Re: California 2011-2012 Flu Season: Weeks 40-15 (Six New Deaths; Total 26)

Week 15: Regional
6 new deaths; total 26 (one was in a child under 18 years and 5 were in adults aged 22-58 years. To date during the 2011-2012 influenza season, CDPH has received 26 reports of influenza-associated deaths among persons less than 65 years old; 5 were among children 0-17 years and 21 were among adults 18-64 years.)

CDPH received two reports of laboratory-confirmed influenza outbreaks in week 15; both were in congregate living facilities and were associated with influenza A (H3).

ILI: 2.1%
22.6% positive for influenza
http://www.cdph.ca.gov/HealthInfo/discond/Pages/Influenza(Flu).aspx
 
Re: California 2011-2012 Flu Season: Weeks 40-16 (Two New Deaths; Total 29)

Re: California 2011-2012 Flu Season: Weeks 40-16 (Two New Deaths; Total 29)

Week 16: Regional
2 new deaths (1 under age 18; 1 age 55-64); total 29 (6 were among children 0-17 years and 23 were among adults 18-64 years)
ILI: 1.3%

25.9% positive for influenza
Of the 113 influenza isolates tested during the 2011-12 influenza season, one was resistant to neuraminidase inhibitors.
Of the 103 specimens from California residents that have been strain-typed this season, all but eight influenza B strains matched the 2011-12 influenza vaccine.

CDPH received three reports of laboratory-confirmed influenza outbreaks in week 16; all were in congregate living facilities and were associated with influenza A (2009 H1N1) and influenza A (subtype not done).
http://www.cdph.ca.gov/HealthInfo/discond/Pages/Influenza(Flu).aspx
 
Re: California 2011-2012 Flu Season: Weeks 40-16 (Two New Deaths; Total 29)

Re: California 2011-2012 Flu Season: Weeks 40-16 (Two New Deaths; Total 29)

Here is the Week 16 chart showing % Positive Influenza cases in California.

CA Week 16 %ILI.png

http://www.cdph.ca.gov/programs/dcdc/Documents/Final_FluReport_Ending_04212012.pdf
 
Re: California 2011-2012 Flu Season: Weeks 40-17 (Four New Deaths; Total 33)

Re: California 2011-2012 Flu Season: Weeks 40-17 (Four New Deaths; Total 33)

Week 17: Regional
4 new deaths (ages 40-64 years occurring in December 2011, March 2012 and April 2012); total 33

ILI: 1.1%
12.2% positive for influenza

CDPH received three reports of laboratory-confirmed influenza outbreaks in week 17; two in congregate living facilities that were associated with influenza A (subtype not done) and one in a school that was associated with influenza B.
http://www.cdph.ca.gov/HealthInfo/discond/Pages/Influenza(Flu).aspx
 
Re: California 2011-2012 Flu Season: Weeks 40-18 (No New Deaths; Total 33)

Re: California 2011-2012 Flu Season: Weeks 40-18 (No New Deaths; Total 33)

Week 18: Local
No new deaths; total 33

ILI: 2.9%
13.6% positive for influenza
CDPH received one report of a laboratory-confirmed influenza outbreak in week 18 in a congregate living facility that was associated with influenza A (H3).
http://www.cdph.ca.gov/HealthInfo/discond/Pages/Influenza(Flu).aspx
 
Re: California 2011-2012 Flu Season: Weeks 40-19

Re: California 2011-2012 Flu Season: Weeks 40-19

Week 19: Local
3 new deaths; total 36

Outpatient influenza-like illness (ILI) decreased 1.3% in week 19 (1.4%) compared to week 18 (2.7%).

6.2% positive for influenza; no suspected or confirmed influenza A (H3N2)v [variant influenza A (H3N2), formerly called swine-origin triple reassortant A (H3N2)] has been detected in California.

CDPH received one report of a laboratory-confirmed influenza outbreak in week 19 in a congregate living facility that was associated with influenza A (no subtyping performed).
http://www.cdph.ca.gov/HealthInfo/discond/Pages/Influenza(Flu).aspx
 
Re: California 2011-2012 Flu Season: FINAL REPORT

July 2012: FINAL REPORT (according to CDPH website) for 2011-12 flu season

196 reports of influenza-associated severe illness or death were reported among <65 year olds. Of these, 152 were non-fatal (77.6%) and 44 fatal (22.4%).

Age group/ non-fatal / fatal
0-4 yrs / 36 (23.7) / 6 (13.6)
5-17yr / 32 (21.1) / 1 (2.3)
18-49 / 51 (33.6) / 18 (40.9)
50-64 / 33 (21.7) / 19 (43.2)

Of the 196 influenza severe cases, 166 (84.7%) were influenza A; 27(13.8%) were influenza B.
http://www.cdph.ca.gov/HealthInfo/discond/Pages/Influenza(Flu).aspx
 
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