Influenza Update:2010-2011 Season
Contributors: Lesley Brannan, Tony Aragon, Irene Brown
Carol M Davis, MSPH, CPHEpidemiologist
Emerging and Acute Infectious Diseases BranchTexas Department of State Health Service
Percentage of Visits Due to Influenza-Like IllnessReported by Texas Participants in ILINet, 2007-2011 Seasons
0%
2%
4%
6%
8%
10%
12%
14%
16%
18%
20%
40
41
42
43
44
45
46
47
48
49
50
51
52 1 2 3 4 5 6 7 8 9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
Oct Nov Dec Jan Feb Mar Apr May June July Aug Sept
MMWR week
Pe
rce
nta
ge
of
Vis
its
Du
e t
o I
LI
2007-2008 2008-2009 2009-2010 2010-2011
Circulating Influenza Viruses
47%
21%
8%
24%
Flu A, not subtyped
Flu A, H3N2
Flu A, 2009 H1N1
Flu B
Texas: 2010-2011 influenza seasonthrough week 5
Vaccine Breakthrough
• DSHS has been receiving calls asking about potential influenza vaccine breakthrough this season– Voluntary reporting of suspected cases
• Influenza vaccine expectations– 70-90% in healthy adults <65– Less in certain subgroups (age/immunocompetence)
• Antigenic testing– All 29 Texas specimens tested so far were related to
a component of the 2010-2011 vaccine– 100% of H1N1, 99% of H3N2 and 93% of the Flu B
strains tested by the CDC were related to their respective components in the vaccine
Outbreaks
• 5 nursing home influenza outbreaks reported to DSHS in 2011– No deaths associated with these outbreaks
• CDC informal survey of state flu coordinators
• Recommend following CDC guidance www.cdc.gov/flu/professionals/infectioncontrol/– Report outbreaks (1 confirmed case)– Droplet precautions– Cohorting of ill / exposed; restrict movement– Provide antiviral treatment and chemoprophylaxis– Vaccinate unvaccinated individuals per
recommendations
Influenza Information
• Weekly DSHS report
www.texasflu.org
• Weekly CDC report
www.cdc.gov/flu/weekly/