Influenzalike illness ili in the united states typically begins to increase in late december or early january and peaks in february most commonly. Flu season is the time of year when you are most likely to get sick from the flu. Effectiveness of influenza vaccine for preventing laboratory. During the 20112012 influenza season october 2, 2011 to september 29, 2012, influenza activity first began to increase in the southern and southeastern states in november, and peaked nationally in late february and early march. In comparison to other seasons, the 20112012 season set a new record for the lowest and shortest peak of influenzalike illness. Influenza activity united states, 201011 season, and composition of the 2011 12 influenza vaccine. H3n2 is a subtype of the viral genus influenzavirus a. Jan 10, 20 when the flu season was first dominated by h1n1, there were almost four times as many flu cases by the last week of december 2009 compared to the last week of december 2012. The key points for the upcoming 20112012 season are that 1 the influenza vaccine composition for the 20112012 season is unchanged from the 20102011 season, 2 annual. During the 2011 2012 flu season, influenza ah3n2, 2009 influenza ah1n1, and influenza b viruses cocirculated in the united states. During the 2010 2011 influenza season, overall influenza activity peaked in early february.
Burden estimates for the 201220 influenza season cdc. Officials urge flu vaccine for unpredictable 201220. In general, flu season can start anytime in late fall, peak in mid to late winter usually january or february, and continue through early spring. Results from the november 2011 national flu survey united states, 2011 12 influenza season recent influenza vaccination trends across influenza seasons influenza vaccination distribution and coverage, united states, 201011 and 2011 12 seasons pdf icon 1.
During the 2012 influenza season lac experienced a substantial increase in fatalities attributed to flu compared with the previous two seasons. In comparison, during the 2011 2012 influenza season, 300 cases were seen during the peak in the week ending march 24, 2012 mmwr week 12. Among the worst hit thus far is the city of boston, which has had 700 documented cases of the flu already, 10 times as many as the 20112012 flu seasons 70 documented cases. Utah 20112012 influenza season weekly update data is for. To better contextualize the data presented in these reports, we have grouped them by season rather than calendar year. Influenza vaccine coverage 2011 2012 influenza season. A history of major flu pandemics world news the guardian. All three studies suggest that during the 201112 flu season, the vaccine provided modest protection at first, but its effectiveness dropped sharply after 3 or 4 months. Feb 24, 2012 currently, flu activity is highest in the midwest, with highlevel activity in missouri. Its possible that climate change that causes swings in temperature from season to season could have an impact on the severity of influenza transmission, simanek says. Vaccination coverage levels of healthcare workers who received influenza vaccine during 2011. Jan 10, 20 during the 2010 to 2011 season, 115 children died of flu, the cdc says. Starting in the 201220 season, the recommendation shifted from a trivalent influenza vaccine tiv containing three strains to a quadrivalent influenza vaccine qiv that contains both influenza b lineages. Officials urge flu vaccine for unpredictable 201220 season.
Texas influenza summary report, 201220 season september 30, 2012 september 28, 20. Statistics summary 2012 pdf mdh uses several systems during influenza season to estimate the level of influenza activity among minnesotans. Vaers and vsd will continue to monitor this season for increases in febrile seizures in children. For the 20112012 influenza season, approximately one third of the ihs patient population received a flu vaccine. The past three flu seasons have been predominated by type a influenza h3n2 however for the 2012 season a. According to the cdc, flurelated deaths between the years of 1976 and 2007 ranged from 3,000 to 49,000. For the 2011 2012 influenza season, approximately one third of the ihs patient population received a flu vaccine. Florida influenza surveillance reports florida department. Therefore, the number and timing of individually reported influenza cases was much higher and earlier for the 201220 season when compared to the 20112012 season.
Further post hoc analyses estimated current season 20112012 ve stratified by prior season 20102011 vaccination status, plus ve for each combination of current and prior season vaccine exposure ie, current only, both current and prior, prior only with those subjects unvaccinated in both seasons as the reference group. The cdc has frequently asked questions for the 201220 influenza season. Statewide testing for flu nys and nyc all laboratories public, private, hospital, commercial, etc. Currently, flu activity is highest in the midwest, with highlevel activity in missouri. Uk in grip of worst flu season since 2011 bbc news. The purpose of this statement is to update recommendations for routine use of trivalent seasonal influenza vaccine and antiviral medications for the prevention and treatment of influenza in children. Therefore, the number and timing of individually reported influenza cases was much higher and earlier for the 2012 20 season when compared to the 2011 2012 season. Uk in grip of worst flu season since 2011 by nick triggle health correspondent. Mar 28, 2012 influenza has caused many millions of deaths worldwide with the spanish flu pandemic of 1918 the most deadly. When is flu season and why there is a flu season in the. Three children have died of flu during this 20112012 season. The following is a list of who recommended strains for the northern hemisphere influenza season. Medication prescription and dispensing information within 7 days from the date of enrollment was verified by pharmacy, insurance, and electronic medical records. The 2012 20 flu season was particularly harsh in the united states, where the majority of states were reporting high rates of influenzalike illness.
Flu graph by hospitalization erie county, 20112012. The 2012 20 flu season was an epidemic flu season in the us. New york state department of health 20112012 flu monitoring. Overall, influenza activity was among the lowest flu activity seasons recorded during the past decade. Historical annual reformulations of the influenza vaccine. Coverage for the 2011 2012 influenza season was similar to coverage reported for the 2010 2011 season for all age and risk groups except for pregnant women.
The report found approximately 67 percent of health care workers got vaccinated in 20112012 a 3 percent rise from the prior flu season and physicians were most likely 86 percent of them to. Connecticut department of public health influenza final. Also, ili reached the baseline for only 1 week during the season. During the 2011 2012 flu season, the overall vaccination rate was approximately 42%. The season began late and was mild compared to most previous seasons for which surveillance data is available. Jan 31, 20 all three studies suggest that during the 2011 12 flu season, the vaccine provided modest protection at first, but its effectiveness dropped sharply after 3 or 4 months. Overview the 201220 influenza season was classified as moderately severe in the us 1. Seeing as how there arent any other articles like this one e.
Influenza has caused many millions of deaths worldwide with the spanish flu pandemic of 1918 the most deadly. Sep 15, 2014 during the 20112012 influenza season, antiviral medication data were collected at 3 of the 5 sites. The 20112012 flu season is upon us todd, betsy, mph, rn, cic ajn the american journal of nursing. In contrast to the 201112 season, the ongoing 2012 season is off to an unusually early and severe start, despite the fact that the national climate this past autumn was close to the seasonal average. Last flu season officially began in february 2012, but pediatric deaths were monitored from october of the previous year.
Influenza activity united states, 201011 season, and composition of the 201112 influenza vaccine. During the 2010 to 2011 season, 115 children died of flu, the cdc says. Coverage for the 20112012 influenza season was similar to coverage reported for the 20102011 season for all age and risk groups except for pregnant women. Providers, by influenza surveillance region, october 2, 2011may 26, 2012 compared to the previous two influenza seasons, the 20112012 season was a mild season with a late peak in activity figure 2. A multicenter study by researchers in eight european countries indicated that overall vaccine effectiveness ve against influenza ah3n2 in the first months of the season was. During the 201011 influenza season, fda and cdc detected an increase in the number of reports to vaers of febrile seizures following trivalent influenza vaccine iiv3 vaccination flu shot in children younger than 2 years of age. Recommendations for prevention and control of influenza in.
The overall burden of influenza for the 201220 season was an estimated 34 million influenza illnesses, 16 million influenzaassociated medical visits, 571,000 influenzarelated hospitalizations, and 43,000 fluassociated deaths estimated influenza disease burden, by season united states, 201011 through 201718 influenza seasons. Us data indicated that hospitalization rates in persons of all ages were lower. Data reported in this slide set include cases and deaths from october 2012 through may 20. By the week ending 29 december 2012, the cdc reported that 29 u. The weekly report for the 2012 influenza season will begin in october 2012. In years in which h3n2 is the predominate strain, there are more hospitalizations. During the 20112012 flu season, the overall vaccination rate was approximately 42%. Influenza activity, surveillance and reports new york state. The key points for the upcoming 20112012 season are that 1 the influenza vaccine composition for the 20112012 season is unchanged from the 20102011 season, 2 annual universal. Here we analyzed the weekly time series of confirmed influenza cases in the us from the 199798 influenza season to present. Week 4 january 1925, 2020 week 3 january 1218, 2020 week 2.
Utah 20112012 influenza season weekly update data is. During the 20112012 influenza season, antiviral medication data were collected at 3 of the 5 sites. Influenza a virus subtype h3n2 ah3n2 is a subtype of viruses that causes influenza flu. Jan 14, 2011 so far, the 2010 2011 flu season has claimed the lives of eight children. Three children have died of flu during this 2011 2012 season.
During the 20102011 influenza season, overall influenza activity peaked in early february. In comparison, during the 20112012 influenza season, 300 cases were seen during the peak in the week ending march 24, 2012 mmwr week 12. Connecticut department of public health influenza final surveillance summary for 20112012 flu season the following describes influenza activity in connecticut during the 20112012 influenza season august 28, 2011june 9, 2012. When the flu season was first dominated by h1n1, there were almost four times as many flu cases by the last week of december 2009 compared to the last week of december 2012. It will usually end by april, but in some years it can linger into may.
Sep 27, 2018 according to available records, 20172018s flu season was the worst since the 19761977 season. Flu vaccine effectiveness waned over 201112 season. In general, flu season can start anytime in late fall, peak in midtolate winter usually january or february, and continue through early spring. Jan 10, 20 among the worst hit thus far is the city of boston, which has had 700 documented cases of the flu already, 10 times as many as the 2011 2012 flu season s 70 documented cases. Jan 18, 2018 uk in grip of worst flu season since 2011 by nick triggle health correspondent. Influenza vaccine effectiveness in the 20112012 season. But the following year, the 2012 flu season was moderately severe, according to the cdc. Texas influenza summary report, 201220 in pdf format. Recommended composition of influenza virus vaccines for use in the 20112012 northern hemisphere influenza season. How well the flu vaccine works can range widely from season to season. Worst flu outbreak in recent history strikes united states. The 201220 flu season was particularly harsh in the united states, where the majority of states were reporting high rates of influenzalike illness.
Overview the 20112012 season was classified as mild both for the us and texas. Last flu season officially began in february 2012, but pediatric deaths. By comparison, there were only 119 hospitalizations reported during the mild 20112012 flu season. Over the course of the season, predominant viruses varied from region to.
Count of reported laboratoryconfirmed influenzaassociated deaths by year season count of deaths reported for the 20182019 season 20182019 245 20172018 296 20162017 278 20152016 67 20142015 156 202014 80 2012 20 54 2011 2012 20 2010 2011 36. From 2010 to 2016, the flurelated death rate was between 12,000 and 56,000, with the highest season being 2012 to 20 and the lowest being 2011 to 2012. The past three flu seasons have been predominated by type a influenza h3n2 however for the 2012 season a different strain emerged antigenically characterized as avictoria3612011, whereas the previous two seasons were primarily of the perth lineage, aperth162009. During the 20112012 influenza season, we enrolled hospitalized adults with acute respiratory illness and tested each for influenza using reverse tra we use cookies to enhance your experience on our website. Influenza activity, surveillance and reports new york. Sep 27, 2012 the report found approximately 67 percent of health care workers got vaccinated in 2011 2012 a 3 percent rise from the prior flu season and physicians were most likely 86 percent of them to. During the 20112012 season, ili remained low through february and did not peak until midmarch. In birds, humans, and pigs, the virus has mutated into many strains. It is recommended that vaccines for use in the 20112012 influenza season northern hemisphere contain the following. Connecticut department of public health influenza final surveillance summary for 2011 2012 flu season the following describes influenza activity in connecticut during the 2011 2012 influenza season august 28, 2011 june 9, 2012. During the 20112012 flu season, influenza ah3n2, 2009 influenza ah1n1, and influenza b viruses cocirculated in the united states.
According to available records, 20172018s flu season was the worst since the 19761977 season. Who recommended composition of influenza virus vaccines. The department of health doh, in collaboration with local health jurisdictions and the centers disease control and prevention cdc, performed surveillance for influenza during the 2017 to 2018 season using several different systems. Final vaccine effectiveness ve estimates for the 201220 influenza season found that influenza vaccine was 52% 95% ci, 46% to 58% effective at preventing medicallyattended acute respiratory illnesses caused by circulating influenza a and b viruses in people of all ages.
By continuing to use our website, you are agreeing to our use of cookies. Past seasons estimated influenza disease burden cdc. Use of influenza antiviral agents by ambulatory care. In comparison to other seasons, the 2011 2012 season set a new record for the lowest and shortest peak of influenzalike illness. Count of reported laboratoryconfirmed influenzaassociated deaths by year season count of deaths reported for the 20182019 season 20182019 245 20172018 296 20162017 278 20152016 67 20142015 156 202014 80 201220 54 20112012 20 20102011 36. During the 2012 influenza season, texas and us ilinet data indicated that the peak percentage of visits due to ili and. Most deaths are caused by complications of the flu, including pneumonia or a secondary. Over the course of the season, predominant viruses varied from region to region and between states, but nationally, influenza ah3n2 influenza viruses predominated. However, it was not as bad as the 1918 flu pandemic, which lasted two years and historians. Past season summaries are available on the department of health website. Additional information about flu activity during the 2010 2011 season can be found in the mmwr article update.