Connecticut Influenza Reports Winter 2015-16

[Ronan Kelly]

Influenza Season, Update for Week 10*
(Week ending Saturday, 03/12/2016)

http://www.ct.gov/dph/lib/dph/infectious_diseases/flu/stats/thisweeksfluupdate.pdf

Key Points
 Flu activity has continued to increase in Connecticut and in parts of the country; it is currently classified
geographically in Connecticut as widespread**.
 The predominant influenza viruses identified this season are Type A.
 The predominate Type A isolates subtyped have been 2009 H1N1.
 It is important to take steps to prevent influenza-related illness and hospitalization:

http://www.ct.gov/dph/cwp/view.asp?a=3115&q=500340

...
 Statewide emergency department visits attributed to the ?fever/flu syndrome? have reached 9.6% statewide;
5% is generally considered the minimum threshold when there are elevated influenza-associated ED visits
(Figure 1).
 The percentage of outpatient visits with influenza-like illness (ILI) has exceeded 3% statewide in 4 of the
past 7 weeks; 1% is generally considered the baseline when there are increased influenza-associated visits in
the outpatient setting (Figure 2).
 The percentage of unscheduled hospital admissions due to pneumonia has exceeded 4% statewide during 8
of the past 10 weeks; 4% is generally considered the baseline when there may be increased pneumonia
hospitalizations due to influenza (Figure 3).
 A total of 573 hospitalized patients with laboratory-confirmed influenza have been reported. Of these
reports, 446 are Type A (subtype unspecified), 75 are Type A (2009 H1N1), 3 are Type A (H3N2), and 49
are influenza B virus. Five influenza-associated deaths have been reported; four were patients greater than
65 years of age and one was in a patient 50-64 years of age (Figures 4 & 5).
 A total of 1,965 positive influenza reports have been reported for the current season. Influenza was reported
in all eight Connecticut counties: Fairfield (612), New Haven (540), Hartford (476), Tolland (95), New
London (83), Litchfield (66), Middlesex (53), and Windham (40). Of the 1,965 positive influenza reports:
1,311 are Type A (subtype unspecified), 356 are Type A (2009 H1N1), 20 are Type A (H3N2), and 278 are
influenza B virus (Figures 6 & 7).
...

[Ronan Kelly]

Influenza Season, Update for Week 11*
(Week ending Saturday, 03/19/2016)

http://www.ct.gov/dph/lib/dph/infectious_diseases/flu/stats/thisweeksfluupdate.pdf

Key Points
 Flu activity has continued to increase in Connecticut and in parts of the country; it is currently classified
geographically in Connecticut as widespread**.
 The predominant influenza viruses identified this season are Type A, although an increasing number of
Type B flu viruses are being reported.
 The predominate Type A isolates subtyped have been 2009 H1N1.
 It is important to take steps to prevent influenza-related illness and hospitalization:

http://www.ct.gov/dph/cwp/view.asp?a=3115&q=500340

...
 Statewide emergency department visits attributed to the ?fever/flu syndrome? had reached 9.6% and it is
currently at 8.8% statewide; 5% is generally considered the minimum threshold when there are elevated
influenza-associated ED visits (Figure 1).
 The percentage of outpatient visits with influenza-like illness (ILI) has exceeded 3% statewide in 4 of the
past 7 weeks; 1% is generally considered the baseline when there are increased influenza-associated visits in
the outpatient setting (Figure 2).
 The percentage of unscheduled hospital admissions due to pneumonia has exceeded 4% statewide during 8
of the past 10 weeks; 4% is generally considered the baseline when there may be increased pneumonia
hospitalizations due to influenza (Figure 3).
 A total of 709 hospitalized patients with laboratory-confirmed influenza have been reported. Of these
reports, 556 are Type A (subtype unspecified), 87 are Type A (2009 H1N1), 5 are Type A (H3N2), and 61
are influenza B virus. Seven influenza-associated deaths have been reported; six were patients greater than
65 years of age and one was in a patient 50-64 years of age (Figures 4 & 5).
 A total of 2,596 positive influenza reports have been reported for the current season. Influenza was reported
in all eight Connecticut counties: Fairfield (843), New Haven (681), Hartford (626), New London (142),
Tolland (107), Litchfield (81), Middlesex (59), and Windham (57). Of the 2,596 positive influenza reports:
1,625 are Type A (subtype unspecified), 532 are Type A (2009 H1N1), 24 are Type A (H3N2), and 415 are
influenza B virus (Figures 6 & 7).
...

[Ronan Kelly]

Influenza Season, Update for Week 12*
(Week ending Saturday, 03/26/2016)

http://www.ct.gov/dph/lib/dph/infectious_diseases/flu/stats/thisweeksfluupdate.pdf

Key Points
 Flu activity may now have peaked in Connecticut and in most of the country; it is currently classified
geographically in Connecticut as widespread**.
 The predominant influenza viruses identified this season are Type A, although an increasing number of
Type B flu viruses are being reported.
 The predominant Type A isolates subtyped have been 2009 H1N1.
 It is important to take steps to prevent influenza-related illness and hospitalization:

http://www.ct.gov/dph/cwp/view.asp?a=3115&q=500340

...
 Statewide emergency department visits attributed to the ?fever/flu syndrome? had reached 9.6% and it is
currently at 7.9% statewide; 5% is generally considered the minimum threshold when there are elevated
influenza-associated ED visits (Figure 1).
 The percentage of outpatient visits with influenza-like illness (ILI) has exceeded 3% statewide in 3 of the
past 7 weeks; 1% is generally considered the baseline when there are increased influenza-associated visits in
the outpatient setting (Figure 2).
 The percentage of unscheduled hospital admissions due to pneumonia has exceeded 4% statewide during 8
of the past 10 weeks; 4% is generally considered the baseline when there may be increased pneumonia
hospitalizations due to influenza (Figure 3).
 A total of 812 hospitalized patients with laboratory-confirmed influenza have been reported. Of these
reports, 622 are Type A (subtype unspecified), 100 are Type A (2009 H1N1), 5 are Type A (H3N2), and 85
are influenza B virus. Eight influenza-associated deaths have been reported; six were patients greater than
65 years of age and two were patients 50-64 years of age (Figures 4 & 5).
 A total of 3,060 positive influenza reports have been reported for the current season. Influenza was reported
in all eight Connecticut counties: Fairfield (967), New Haven (862), Hartford (708), New London (159),
Tolland (117), Litchfield (101), Middlesex (75), and Windham (71). Of the 3,060 positive influenza
reports: 1,854 are Type A (subtype unspecified), 616 are Type A (2009 H1N1), 28 are Type A (H3N2), and
562 are influenza B virus (Figures 6 & 7).
...

[Ronan Kelly]

Influenza Season, Update for Week 13*
(Week ending Saturday, 04/02/2016)

http://www.ct.gov/dph/lib/dph/infectious_diseases/flu/stats/thisweeksfluupdate.pdf

Key Points
 Flu activity has now peaked in Connecticut and in most of the country; it is currently classified
geographically in Connecticut as widespread**.
 The predominant influenza viruses identified this season are Type A, although an increasing number of
Type B flu viruses are being reported.
 The predominant Type A isolates subtyped have been 2009 H1N1.
 It is important to take steps to prevent influenza-related illness and hospitalization:

http://www.ct.gov/dph/cwp/view.asp?a=3115&q=500340

...
 Statewide emergency department visits attributed to the ?fever/flu syndrome? had reached 9.6% and it is
currently at 7.8% statewide; 5% is generally considered the minimum threshold when there are elevated
influenza-associated ED visits (Figure 1).
 The percentage of outpatient visits with influenza-like illness (ILI) has exceeded 3% statewide in 3 of the
past 7 weeks; 1% is generally considered the baseline when there are increased influenza-associated visits in
the outpatient setting (Figure 2).
 The percentage of unscheduled hospital admissions due to pneumonia has exceeded 4% statewide during 7
of the past 10 weeks; 4% is generally considered the baseline when there may be increased pneumonia
hospitalizations due to influenza (Figure 3).
 A total of 881 hospitalized patients with laboratory-confirmed influenza have been reported. Of these
reports, 655 are Type A (subtype unspecified), 108 are Type A (2009 H1N1), 8 are Type A (H3N2), and
110 are influenza B virus. Reports of ten additional influenza-associated deaths were recently received,
which occurred during the peak activity weeks in March. These new reports increased our seasonal total
influenza-associated deaths to 18. Of these, 10 were patients greater than 65 years of age, six were 50-64
years of age, and two were 25-49 years of age (Figures 4 & 5).
 A total of 3,561 positive influenza reports have been reported for the current season. Influenza was reported
in all eight Connecticut counties: Fairfield (1,178), New Haven (1,043), Hartford (765), New London (172),
Tolland (130), Litchfield (103), Middlesex (91), and Windham (79). Of the 3,561 positive influenza
reports: 2,037 are Type A (subtype unspecified), 729 are Type A (2009 H1N1), 38 are Type A (H3N2), and
757 are influenza B virus (Figures 6 & 7).
...

[Ronan Kelly]

Influenza Season, Update for Week 14*
(Week ending Saturday, 04/09/2016)

http://www.ct.gov/dph/lib/dph/infectious_diseases/flu/stats/thisweeksfluupdate.pdf

Key Points
 Flu activity has now peaked in Connecticut and in most of the country; it is currently classified
geographically in Connecticut as widespread**.
 The predominant influenza viruses identified this season are Type A, although an increasing number of
Type B flu viruses are continuing to be reported.
 The predominant Type A isolates subtyped have been 2009 H1N1.
 It is important to take steps to prevent influenza-related illness and hospitalization:

http://www.ct.gov/dph/cwp/view.asp?a=3115&q=500340

...
 Statewide emergency department visits attributed to the ?fever/flu syndrome? had reached 9.6% and it is
currently at 6.3% statewide; 5% is generally considered the minimum threshold when there are elevated
influenza-associated ED visits (Figure 1).
 The percentage of outpatient visits with influenza-like illness (ILI) has exceeded 3% statewide in 3 of the
past 7 weeks; 1% is generally considered the baseline when there are increased influenza-associated visits in
the outpatient setting (Figure 2).
 The percentage of unscheduled hospital admissions due to pneumonia has exceeded 4% statewide during 7
of the past 10 weeks; 4% is generally considered the baseline when there may be increased pneumonia
hospitalizations due to influenza (Figure 3).
 A total of 969 hospitalized patients with laboratory-confirmed influenza have been reported. Of these
reports, 701 are Type A (subtype unspecified), 115 are Type A (2009 H1N1), 8 are Type A (H3N2), and
145 are influenza B virus. A total of 25 reports of influenza-associated deaths have been received to date,
most associated with illness occurring during this season?s peak activity weeks in March. Of these, 16 were
patients greater than 65 years of age, seven were 50-64 years of age, and two were 25-49 years of age
(Figures 4 & 5).
 A total of 3,985 positive influenza reports have been reported for the current season. Influenza was reported
in all eight Connecticut counties: Fairfield (1,327), New Haven (1,156), Hartford (852), New London (185),
Tolland (139), Litchfield (122), Middlesex (103), and Windham (101). Of the 3,985 positive influenza
reports: 2,193 are Type A (subtype unspecified), 809 are Type A (2009 H1N1), 42 are Type A (H3N2), and
941 are influenza B virus (Figures 6 & 7).
...

[Ronan Kelly]

Influenza Season, Update for Week 15*
(Week ending Saturday, 04/16/2016)

http://www.ct.gov/dph/lib/dph/infectious_diseases/flu/stats/thisweeksfluupdate.pdf

Key Points
 Flu activity is now past peak in Connecticut and in most of the country; however, it continues to be
classified geographically in Connecticut as widespread**.
 The predominant influenza viruses identified this season are Type A, although an increasing number of
Type B flu viruses are continuing to be reported.
 The predominant Type A isolates subtyped have been 2009 H1N1.
 It is still important to take steps to prevent influenza-related illness and hospitalization:

http://www.ct.gov/dph/cwp/view.asp?a=3115&q=500340

...
 Statewide emergency department visits attributed to the ?fever/flu syndrome? had reached 9.6% and it is
currently at 6.1% statewide; 5% is generally considered the minimum threshold when there are elevated
influenza-associated ED visits (Figure 1).
 The percentage of outpatient visits with influenza-like illness (ILI) had reached 4.2% and is currently at
1.8%; 1% is generally considered the baseline when there are increased influenza-associated visits in the
outpatient setting (Figure 2).
 The percentage of unscheduled hospital admissions due to pneumonia has been below 4% statewide during
the past 3 weeks; 4% is generally considered the baseline when there may be increased pneumonia
hospitalizations due to influenza (Figure 3).
 A total of 1,090 hospitalized patients with laboratory-confirmed influenza have been reported. Of these
reports, 741 are Type A (subtype unspecified), 155 are Type A (2009 H1N1), 9 are Type A (H3N2), and
185 are influenza B virus. A total of 26 reports of influenza-associated deaths have been received to date,
most associated with illness occurring during this season?s peak activity weeks in March. Of these, 17 were
patients greater than 65 years of age, seven were 50-64 years of age, and two were 25-49 years of age
(Figures 4 & 5).
 A total of 4,489 positive influenza reports have been reported for the current season. Influenza was reported
in all eight Connecticut counties: Fairfield (1,454), New Haven (1,245), Hartford (1,059), New London
(208), Tolland (154), Litchfield (136), Windham (121), and Middlesex (112). Of the 4,489 positive
influenza reports: 2,361 are Type A (subtype unspecified), 909 are Type A (2009 H1N1), 46 are Type A
(H3N2), and 1,173 are influenza B virus (Figures 6 & 7).
...

[Ronan Kelly]

Influenza Season, Update for Week 16*
(Week ending Saturday, 04/23/2016)

http://www.ct.gov/dph/lib/dph/infectious_diseases/flu/stats/thisweeksfluupdate.pdf

Key Points
 Flu activity is now past peak in Connecticut and in most of the country; however, it continues to be
classified geographically in Connecticut as widespread**.
 The predominant influenza viruses identified this season are Type A, although an increasing number of
Type B flu viruses are continuing to be reported.
 The predominant Type A isolates subtyped have been 2009 H1N1.
 It is still important to take steps to prevent influenza-related illness and hospitalization:

http://www.ct.gov/dph/cwp/view.asp?a=3115&q=500340

...

 Statewide emergency department visits attributed to the ?fever/flu syndrome? had reached 9.6% and it is
currently at 5.9% statewide; 5% is generally considered the minimum threshold when there are elevated
influenza-associated ED visits (Figure 1).
 The percentage of outpatient visits with influenza-like illness (ILI) had reached 4.2% and is currently at
1.6%; 1% is generally considered the baseline when there are increased influenza-associated visits in the
outpatient setting (Figure 2).
 The percentage of unscheduled hospital admissions due to pneumonia has been below 4% statewide during
the past 4 weeks; 4% is generally considered the baseline when there may be increased pneumonia
hospitalizations due to influenza (Figure 3).
 A total of 1,136 hospitalized patients with laboratory-confirmed influenza have been reported. Of these
reports, 751 are Type A (subtype unspecified), 172 are Type A (2009 H1N1), 9 are Type A (H3N2), and
204 are influenza B virus. A total of 28 reports of influenza-associated deaths have been received to date,
most associated with illness occurring during this season?s peak activity weeks in March. Of these, 18 were
patients greater than 65 years of age, seven were 50-64 years of age, and three were 25-49 years of age
(Figures 4 & 5).
 A total of 4,741 positive influenza reports have been reported for the current season. Influenza was reported
in all eight Connecticut counties: Fairfield (1,536), New Haven (1,309), Hartford (1,121), New London
(217), Tolland (168), Litchfield (141), Windham (133), and Middlesex (116). Of the 4,741 positive
influenza reports: 2,397 are Type A (subtype unspecified), 1,013 are Type A (2009 H1N1), 50 are Type A
(H3N2), and 1,281 are influenza B virus (Figures 6 & 7).
...

[Ronan Kelly]

Influenza Season, Update for Week 18*
(Week ending Saturday, 05/07/2016)

http://www.ct.gov/dph/lib/dph/infectious_diseases/flu/stats/thisweeksfluupdate.pdf

Key Points
 Flu activity is past peak in Connecticut and throughout the country; however, it continues to be classified
geographically in Connecticut as widespread**.
 The predominant influenza viruses identified this season are Type A, although most of the viruses reported
during weeks 17 and 18 were identified as Type B influenza.
 The predominant Type A isolates subtyped have been 2009 H1N1.
 It is still important to take steps to prevent influenza-related illness and hospitalization:

http://www.ct.gov/dph/cwp/view.asp?a=3115&q=500340

...

 Statewide emergency department visits attributed to the ?fever/flu syndrome? had reached 9.6% and it is
currently at 5.1% statewide; 5% is generally considered the minimum threshold when there are elevated
influenza-associated ED visits (Figure 1).
 The percentage of outpatient visits with influenza-like illness (ILI) had reached 4.2% and is currently at
1.4%; 1% is generally considered the baseline when there are increased influenza-associated visits in the
outpatient setting (Figure 2).
 The percentage of unscheduled hospital admissions due to pneumonia has been below 4% statewide during
the past 6 weeks; 4% is generally considered the baseline when there may be increased pneumonia
hospitalizations due to influenza (Figure 3).
 A total of 1,226 hospitalized patients with laboratory-confirmed influenza have been reported. Of these
reports, 766 are Type A (subtype unspecified), 187 are Type A (2009 H1N1), 12 are Type A (H3N2), and
261 are influenza B virus. A total of 33 reports of influenza-associated deaths have been received to date,
most associated with illness occurring during this season?s peak activity weeks in March. Of these, 21 were
patients greater than 65 years of age, nine were 50-64 years of age, and three were 25-49 years of age
(Figures 4 & 5).
 A total of 5,292 positive influenza reports have been reported for the current season. Influenza was reported
in all eight Connecticut counties: Fairfield (1,703), New Haven (1,434), Hartford (1,293), New London
(238), Tolland (191), Litchfield (162), Windham (149), and Middlesex (122). Of the 5,292 positive
influenza reports: 2,508 are Type A (subtype unspecified), 1,164 are Type A (2009 H1N1), 60 are Type A
(H3N2), and 1,560 are influenza B virus (Figures 6 & 7).
...