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Ireland Influenza Surveillance 2013-2014

Re: Ireland Influenza Surveillance 2013-2014

Influenza Surveillance in Ireland ? Weekly Report
Influenza Week 10 2014 (3rd ? 9th March 2014)

Summary
Influenza activity remained at elevated levels in Ireland during week 10 2014, with continuing reports of
confirmed influenza hospital and ICU admissions and outbreaks. Influenza A(H3) is the predominant virus
circulating, and is co-circulating with influenza A(H1)pdm09. Some indicators of influenza activity have
started to decrease.
 Influenza-like illness (ILI): The sentinel GP ILI consultation rate was 49.1 per 100,000 population during
week 10 2014, a slight decrease compared to the updated rate of 54.1 per 100,000 during week 9 2014.
o ILI rates remain above the Irish baseline threshold (21.0 per 100,000 population), for the sixth
consecutive week. o The highest age specific ILI rates during week 10 2014 were in the 0-4 and 15-64 year age groups.
 National Virus Reference Laboratory (NVRL): Influenza positivity decreased during week 10 2014, with 139
(24.8%) influenza positive specimens reported from the NVRL: 96 influenza A(H3), 33 influenza
A(H1)pdm09, 8 influenza A (not subtyped) and 2 influenza B.
 Hospitalisation: 113 confirmed influenza hospitalised cases were reported to HPSC during week 10 2014,
bringing the total number of hospitalised cases reported this season to 400. o The highest age specific rates for confirmed influenza cases admitted to hospital were in those
aged less than 1 year and those aged 65 years and older.
 ICU admissions: 62 confirmed influenza cases were admitted to ICU and reported to HPSC to date this
season, 30 associated with influenza A(H1)pdm09, 19 with A(H3), 13 A (not subtyped).
Mortality: 19 influenza-associated deaths were reported to HPSC to date this season.
 Outbreaks: 14 acute respiratory outbreaks were reported to HPSC during week 10 2014, the majority in
residential care facilities/long stay units/community hospitals.
 Europe: The status of the 2013/2014 influenza season has varied considerably between EU/EEA Member
States. Some countries are experiencing decreasing influenza activity whilst others have reported
increasing activity and high ILI/ARI rates. Influenza A(H1)pdm09 and A(H3) viruses are co-circulating in
outpatient settings; however, A(H1)pdm09 is predominant in hospitalised cases.
...
http://www.hpsc.ie/hpsc/A-Z/Respira...lanceReports/20132014Season/File,14552,en.pdf

Increase in influenza-like illness

During week 9 2014 (week ending March 2nd), the general practitioner consultation rate for influenza-like illness (ILI) in Ireland increased to 53.6 per 100,000 population from an updated rate of 50.5 per 100,000 during week 8 (week ending February 23rd). This rate exceeds the Irish baseline threshold of 21 per 100,000 for the fifth consecutive week (used to assess influenza activity during the 2013/2014 influenza season in Ireland). The rate of increase during week 9 was most pronounced in the 5-14 year age group. Influenza A(H3) is the predominant virus in circulation with influenza A(H1)pdm09 co-circulating. The flu report for week 9 is available here.

Due to the levels of influenza activity reported last week in Ireland, antiviral drugs for the treatment and/or prevention of influenza in at-risk patients are recommended in line with the Interim guidelines on the use of antivirals for the treatment and prophylaxis of influenza which are available here.
...
http://www.hpsc.ie/hpsc/News/MainBody,14551,en.html
 
Re: Ireland Influenza Surveillance 2013-2014

Influenza Surveillance in Ireland ? Weekly Report
Influenza Week 11 2014 (10th ? 16th March 2014)
Summary

 Influenza activity decreased in Ireland during week 11 2014, however remained at elevated levels, with
continuing reports of confirmed influenza hospital and ICU admissions and outbreaks. Influenza A(H3) is
the predominant virus circulating.
 Influenza-like illness (ILI): The sentinel GP ILI consultation rate was 38.2 per 100,000 population during
week 11 2014, a slight decrease compared to the updated rate of 49 per 100,000 during week 10 2014.
o ILI rates remain above the Irish baseline threshold (21.0 per 100,000 population), for the seventh
consecutive week. o The highest age specific ILI rates during week 11 2014 were in those aged 65 years and older;
age specific rates in all other age groups decreased.
 National Virus Reference Laboratory (NVRL): Influenza positivity decreased during week 11 2014, with 84
(22.6%) influenza positive specimens reported from the NVRL: 54 influenza A(H3), 29 influenza
A(H1)pdm09 and one influenza A (not subtyped).
 Hospitalisation: 69 confirmed influenza hospitalised cases were reported to HPSC during week 11 2014,
bringing the total number of hospitalised cases reported this season to 473. o The highest age specific rates for confirmed influenza cases admitted to hospital were in those
aged less than 1 year and those aged 65 years and older.  ICU admissions: 69 confirmed influenza cases were admitted to ICU and reported to HPSC to date this
season, 33 associated with influenza A(H1)pdm09, 26 with A(H3) and 10 A (not subtyped).
Mortality: 20 influenza-associated deaths were reported to HPSC to date this season.
 Outbreaks: 10 acute respiratory outbreaks were reported to HPSC during week 11 2014, the majority in
residential care facilities/long stay units/community hospitals.  Europe: Based on various influenza indicators, the status of the 2013/2014 influenza season has varied
considerably across EU/EEA Member States in terms of the phase of the epidemic, its intensity and the
dominant virus subtype.
...
http://www.hpsc.ie/hpsc/A-Z/Respira...lanceReports/20132014Season/File,14560,en.pdf
 
Re: Ireland Influenza Surveillance 2013-2014

Influenza Surveillance in Ireland ? Weekly Report
Influenza Week 12 2014 (17th ? 23rd March 2014)

Summary
 Most indicators of influenza activity decreased further in Ireland during week 12 2014, however, confirmed influenza hospital and ICU admissions and outbreaks continue to be reported. Influenza A(H3)
has remained the predominant virus circulating this season.
 Influenza-like illness (ILI): The sentinel GP ILI consultation rate was 23.3 per 100,000 population during
week 12 2014, a decrease compared to the updated rate of 44.3 per 100,000 during week 11 2014.
o ILI rates remain above the Irish baseline threshold (21.0 per 100,000 population), for the eighth
consecutive week.
o Age specific ILI rates decreased in all age groups during week 12 2014.
 National Virus Reference Laboratory (NVRL): Influenza positivity increased slightly during week 12 2014,
with 91 (27.5%) influenza positive specimens reported from the NVRL: 70 influenza A(H3), 16 influenza
A(H1)pdm09, 4 influenza A (not subtyped) and one influenza B.
 Hospitalisation: 38 confirmed influenza hospitalised cases were reported to HPSC during week 12 2014,
bringing the total number of hospitalised cases reported this season to 526. o The highest age specific rates for confirmed influenza cases admitted to hospital were in those
aged less than 1 year and those aged 65 years and older.
 ICU admissions: 70 confirmed influenza cases were admitted to ICU and reported to HPSC to date this
season, 36 associated with influenza A(H1)pdm09, 26 with A(H3) and 8 A (not subtyped).
 Mortality: 23 influenza-associated deaths were reported to HPSC to date this season.
 Outbreaks: 4 acute respiratory outbreaks were reported to HPSC during week 12 2014, all in residential
care facilities/long stay units/community hospitals.
 Europe: Influenza activity remained at a moderate to low-intensity level with a stable or decreasing trend
in the majority of the EU/EEA Member States and co-circulation of influenza A(H1)pdm09 and A(H3)
subtypes.
...
 Twenty-three influenza-associated deaths were reported to HPSC this season; one in a 0-4 year old, one
in a 5-14 year old, three in a 15-64 year old and 18 deaths were in patients aged 65 years and over. The
median age of cases who have died during the 2013/2014 influenza season to date is 80 years. Twelve
deaths were associated with influenza A(H3), six with influenza A(H1)pdm09 and three with influenza A
(not subtyped). Two deaths were in clinical ILI cases.
...
http://www.hpsc.ie/hpsc/A-Z/Respira...lanceReports/20132014Season/File,14573,en.pdf
 
Re: Ireland Influenza Surveillance 2013-2014

Influenza Surveillance in Ireland ? Weekly Report
Influenza Week 13 2014 (24th ? 30th March 2014)

Summary

 Most indicators of influenza activity in Ireland remained stable or decreased during week 13 2014. Confirmed influenza hospital and ICU admissions and outbreaks continue to be reported. Influenza A(H3)
has remained the predominant virus circulating this season.
 Influenza-like illness (ILI): The sentinel GP ILI consultation rate was 26.6 per 100,000 population during
week 13 2014, remaining stable compared to the updated rate of 22.8 per 100,000 during week 12 2014.
o ILI rates remain above the Irish baseline threshold (21.0 per 100,000 population), for the ninth
consecutive week.
o Age specific ILI rates were low in all age groups during week 13 2014.
 National Virus Reference Laboratory (NVRL): Influenza positivity decreased during week 13 2014, with 54
(16.1%) influenza positive specimens reported from the NVRL: 35 influenza A(H3), 16 influenza
A(H1)pdm09, 2 influenza A (not subtyped) and one influenza B.
 Hospitalisation: 38 confirmed influenza hospitalised cases were reported to HPSC during week 13 2014,
bringing the total number of hospitalised cases reported this season to 565. o The highest age specific rates for confirmed influenza cases admitted to hospital were in those
aged less than 1 year and those aged 65 years and older.
 ICU admissions: 74 confirmed influenza cases were admitted to ICU and reported to HPSC to date this
season, 37 associated with influenza A(H1)pdm09, 29 with A(H3) and 8 A (not subtyped).
 Mortality: 25 influenza-associated deaths were reported to HPSC to date this season.
 Outbreaks: 5 acute respiratory outbreaks were reported to HPSC during week 13 2014, all in residential
care facilities/long stay units/community hospitals.  Europe: Influenza activity in Europe is declining with the number of influenza positive specimens
decreasing. Influenza viruses are still circulating, with a higher proportion of influenza A(H3) detected than
A(H1)pdm09.
...
Twenty-five influenza-associated deaths were reported to HPSC this season; one in a 0-4 year old, one in
a 5-14 year old, four in 15-64 year olds and 19 deaths were in patients aged 65 years and over. The
median age of cases who have died during the 2013/2014 season to date is 80 years. Fourteen deaths
were associated with influenza A(H3), six with A(H1)pdm09 and three with influenza A (not subtyped).
Two deaths were in clinical ILI cases.  During week 13 2014, no excess all-cause mortality was reported in Ireland after correcting GRO data for
reporting delays with the standardised EuroMOMO algorithm. However, during weeks 6 and 7 2014,
excess all-cause mortality was reported.
...
http://www.hpsc.ie/hpsc/A-Z/Respira...lanceReports/20132014Season/File,14583,en.pdf
 
Re: Ireland Influenza Surveillance 2013-2014

Influenza Surveillance in Ireland ? Weekly Report
Influenza Week 14 2014 (31st March ? 6
th April 2014)
Summary
 All indicators of influenza activity in Ireland decreased during week 14 2014. Influenza continues to
circulate in Ireland, with confirmed influenza outbreaks and hospitalisations still being reported. Influenza
A(H3) has remained the predominant virus circulating this season.  Influenza-like illness (ILI): The sentinel GP ILI consultation rate was 16.2 per 100,000 population during
week 14 2014, a decrease compared to the updated rate of 25.8 per 100,000 during week 13 2014.
o ILI rates are now below the Irish baseline threshold (21.0 per 100,000 population). o Age specific ILI rates were low in all age groups during week 14 2014.  National Virus Reference Laboratory (NVRL): Influenza positivity decreased slightly during week 14 2014,
with 57 (16.1%) influenza positive specimens reported from the NVRL: 44 influenza A(H3), 10 influenza
A(H1)pdm09, 1 influenza A (not subtyped) and two influenza B.  Hospitalisation: 47 confirmed influenza hospitalised cases were reported to HPSC during week 14 2014,
bringing the total number of hospitalised cases reported this season to 612. o The highest age specific rates for confirmed influenza cases admitted to hospital were in those
aged less than 1 year and those aged 65 years and older.  ICU admissions: 75 confirmed influenza cases were admitted to ICU and reported to HPSC to date this
season, 38 associated with influenza A(H1)pdm09, 29 with A(H3) and 8 A (not subtyped).  Mortality: 28 influenza-associated deaths were reported to HPSC to date this season.  Outbreaks: 3 acute respiratory outbreaks were reported to HPSC during week 14 2014, all in residential
care facilities/long stay units/community hospitals.  Europe: Influenza activity in Europe is declining towards interseasonal levels. The proportion of influenza
virus specimens testing positive has substantially decreased this week, with a low level co-circulation of
influenza A(H3) and A(H1)pdm09.
...
 Twenty-eight influenza-associated deaths were reported to HPSC this season; one in a 0-4 year old, one
in a 5-14 year old, four in 15-64 year olds and 22 deaths were in patients aged 65 years and over. The
median age of cases who have died during the 2013/2014 season to date is 80 years. Seventeen deaths
were associated with influenza A(H3), six with A(H1)pdm09 and three with influenza A (not subtyped).
Two deaths were in clinical ILI cases.  During week 14 2014, no excess all-cause mortality was reported in Ireland after correcting GRO data for
reporting delays with the standardised EuroMOMO algorithm. However, during weeks 6 and 7 2014,
excess all-cause mortality was reported.
...
http://www.hpsc.ie/hpsc/A-Z/Respira...lanceReports/20132014Season/File,14588,en.pdf
 
Re: Ireland Influenza Surveillance 2013-2014

Influenza Surveillance in Ireland ? Weekly Report
Influenza Week 15 2014 (7th ? 13th April 2014)

Summary
 All indicators of influenza activity in Ireland decreased during week 15 2014. Influenza continued to
circulate at low levels, with confirmed influenza outbreaks and hospitalisations still being reported.
Influenza A(H3) has remained the predominant virus circulating this season.
 Influenza-like illness (ILI): The sentinel GP ILI consultation rate was 8.9 per 100,000 population during week
15 2014, a decrease compared to the updated rate of 15.6 per 100,000 during week 14 2014.
o ILI rates remained below the Irish baseline threshold (21.0 per 100,000 population). o Age specific ILI rates were low in all age groups during week 15 2014.
 National Virus Reference Laboratory (NVRL): Influenza positivity decreased during week 15 2014, with 33
(11.5%) influenza positive specimens reported from the NVRL: 23 influenza A(H3), 8 A(H1)pdm09, 1 A (not
subtyped) and 1 B.
 Hospitalisation: 29 confirmed influenza hospitalised cases were reported to HPSC during week 15 2014,
bringing the total number of hospitalised cases reported this season to 641. o The highest age specific rates for confirmed influenza cases admitted to hospital were in those
aged less than 1 year and those aged 65 years and older.  ICU admissions: 77 confirmed influenza cases were admitted to ICU and reported to HPSC to date this
season, 38 associated with influenza A(H1)pdm09, 30 with A(H3) and 9 A (not subtyped).
 Mortality: 30 influenza-associated deaths were reported to HPSC to date this season.
 Outbreaks: 4 acute respiratory outbreaks were reported to HPSC during week 15 2014, all in residential
care facilities/long stay units/community hospitals.
 Europe: Overall, influenza activity continued to decline in Europe, with low level circulation of influenza
viruses in the vast majority of reporting countries.
...
http://www.hpsc.ie/hpsc/A-Z/Respira...lanceReports/20132014Season/File,14593,en.pdf
 
Re: Ireland Influenza Surveillance 2013-2014

Influenza Surveillance in Ireland ? Weekly Report
Influenza Weeks 16 & 17 2014 (14th ? 27th April 2014)

Summary
 All indicators of influenza activity in Ireland remained at low levels during weeks 16 and 17 2014.
 Influenza-like illness (ILI): The sentinel GP ILI consultation rates remained low during weeks 16 and 17
2014, at 4.7 and 3.1 per 100,000 population, respectively.
o ILI rates remained below the Irish baseline threshold (21.0 per 100,000 population). o Age specific ILI rates were low in all age groups during weeks 16 and 17 2014.
 National Virus Reference Laboratory (NVRL): Influenza positivity reported from the NVRL decreased further
and remained low during weeks 16 and 17 2014. Eighteen (8.7%) influenza positive specimens were
reported from the NVRL during week 16 2014 and seven (4.8%) during week 17 2014.
 Hospitalisation: Twelve confirmed influenza hospitalised cases were reported to HPSC during week 16 2014
and three were reported during week 17 2014, bringing the total number of hospitalised cases reported
this season to 659. o The highest age specific rates for confirmed influenza cases admitted to hospital were in those
aged less than 1 year and those aged 65 years and older.
 ICU admissions: 81 confirmed influenza cases were admitted to ICU and reported to HPSC to date this
season, 41 associated with influenza A(H1)pdm09, 30 with A(H3) and 10 A (not subtyped).
 Mortality: 33 influenza-associated deaths were reported to HPSC to date this season.
 Outbreaks: 2 acute respiratory outbreaks were reported to HPSC during weeks 16 & 17 2014, one in a
residential care facility and one in a hospital.
 Europe: Overall, both influenza activity and circulation of influenza viruses in Europe are declining.
...
http://www.hpsc.ie/A-Z/Respiratory/...lanceReports/20132014Season/File,14615,en.pdf
 
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