European centre for disease prevention and control ecdc 2020. In years in which h3n2 is the predominate strain, there are more hospitalizations. Hospitalizations and flu season deaths occur mainly among the highrisk groups such as young children below the age of 5 years, the elderly above the age of 65 years, and those with chronic medical illnesses. During the four influenza seasons included in this study, influenza was detected during similar periods, although the season varied from as short as weeks in 2014 2015 to as long as 24 weeks in 2015 2016, and the peak occurred as early as week 3 in 2015 2016 and as late as week 11 in 202014 fig. Week of year grouped by flu season, week 40 us weekly allcause mortality, by flu season, 20 20 2014 2014 2015 2015 2016 20162017 20172018 us weekly healthcare visits for influenza like illness, by flu season, 20. Influenza vaccine effectiveness in households with.
Effectiveness of live attenuated influenza vaccine and. Timothy, a yearold teenager with a mental illness, is feared by his parents. Use of influenza antiviral medications among outpatients. No conclusions as to the total number of cases of illness which occurred can be drawn from this data, due to variations in patterns of specimen submission and testing. Excess mortality for winter seasons 2014, 201415, 201516 and 201617. Influence of birth cohort on effectiveness of 20152016. Flutracking weekly online community survey of influenzalike illness. Estimation of the burden of fluassociation influenzalike illness visits. For example during the 201415 season ari and ili peaked at 5. Despite a life insurance payout, her debts keep piling up as the same illness threatens to kill her daughter as well. The percentage did not change significantly from 20102011 to 202014. Ah1n1 virus ah1n1pdm09 virusassociated illness, by patient birth year, during the 202014 season b and the 20152016 season. B and c, adjusted effectiveness of inactivated influenza vaccines against 2009 pandemic influenza ah1n1 virus ah1n1pdm09 virusassociated illness, by patient birth year, during the 202014 season b and the 2015 2016 season c.
From the start of the 200910 season, the bulletin changed format and became the weekly influenza surveillance overview wiso. During the 202014 influenza season, we analyzed data from 6004 outpatients aged. Advances in nowcasting influenzalike illness rates using. Number of influenza hospitalizations by event date utah, 2015. 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. Overall summary nationally, influenza activity remained low from october 2015 until late december 2015 and peaked in midmarch 2016. In the 2015 16 season, a larger proportion of outbreaks were reported in facilities serving children and the elderly compared to the 2014 season. The spectrum of illness observed thus far during the 2015 2016 season has ranged from mild to severe and is consistent with that of other influenza seasons. Count of reported laboratoryconfirmed influenzaassociated deaths by year season count of deaths reported for the 20182019 season 20182019 245 20172018 296 20162017 278 2015 2016 67 2014 2015 156 202014 80 201220 54 20112012 20 20102011 36.
Week of year grouped by flu season, week 40 us weekly allcause mortality, by flu season, 20 202014 2014 2015 2015 2016 20162017 20172018 us weekly healthcare visits for influenza like illness, by flu season, 20. Health and economic burden of influenzaassociated illness in. Active circulation of influenza has started late in europe in the 202014 season, with a different. Influenza evolution influenza research influenzalike illness vaccine reformulations v t e. Lac 202014 influenza season summary sentinel sites 9 participating associated with at least one positive influenza lab test confirmed influenza death is defined by a positive lab test, compatible symptoms, and clear progression from illness to. Flu season deaths per year in the united states and worldwide. Surveillance was performed from october 2012 through early may 20. Flutracking ili surveillance suggests that 2014 was a moderately more intense season than 20 and similar to 2012. Percent of weekly emergency department ed and urgent care center ucc visits. In kentucky, about 24,000 adolescents aged 12 17 7. Among the 2786 ari patients at higher risk for influenza complications, 835 30% presented to care. The centers for disease control and prevention reported that the available flu vaccine was 60% effective. Earlier research on individual diseases such as adhd and asthma suggested a connection between birth season and incidence, but no largescale studies had been undertaken. Past season summaries are available on the department of health website.
This report contains data from the 2014 2015 influenza season 092820140523 2015 during the 2014 2015 influenza season, influenzalike illness activity increased in early november and peaked in late december. Flu activity peaked during the week ending december 28, 20 for the 202014 season and began a downward trend in early january. These pages includes information about the estimated burden of influenza from past seasons, including tables of the estimated influenza disease burden and 95% credible interval cr i by age group. Annual influenza vaccination has been recommended for all children aged. Past seasons estimated influenza disease burden cdc. Influenza vaccine effectiveness in the united states. Data scientists find connections between birth month and. Health and economic burden of influenzaassociated illness in south africa, 202015. The new york state department of health nysdoh collects, compiles, and analyzes information on flu activity yearround in new york state nys, and produces a weekly report during the flu season october through the following may. Flu reports california department of public health. Influenza ah1n1pdm09 was the dominant strain in 201220, a.
During the 2014 2015 season, the us advisory committee on immunization practices acip preferentially recommended live attenuated influenza vaccine laiv for healthy children aged 28 years based on randomized clinical study data demonstrating. During the 202014 season, influenza a h3n2, 2009 influenza a h1n1, and influenza b viruses circulated in the united states. Backgroundthe ah1n1pdm09 virus strain used in the live attenuated influenza vaccine was changed for the 2015 2016 influenza season because of its lack of effectiveness in young children in. Matthews h5n1 2008 west bengal 2015 united states h5n2 outbreak. The data displayed in this graph were reported on a voluntary basis by wisconsin laboratories and test sites. It further recommended that all persons over age 6. Metapneumovirus infections were more likely during 20. Influenza vaccines reduced the risk of influenza illness in 2015 2016. The chart above represents a 3week moving average and not the actual ili by week. We analyzed us influenza vaccine effectiveness network data from participants aged 2 to 17 years during 4 seasons 20102011 through 202014 to compare relative effectiveness of laiv and iiv against influenzaassociated illness. Weekly influenza updates for the period 2003 20 weekly electronic bulletins 20032009 the weekly electronic bulletin was written by the european influenza surveillance scheme coordination centre from the 200304 to the 200809 season. Influenza activity bureau of infectious disease control. See figure 1 below for ili and ari reported during the 2015 16 season and the previous three influenza seasons.
Cdc reports that the 201516 influenza season was less severe overall. Influenza activity united states, 201516 season and. Recently i coauthored a cdc study that examined how much severe flu illness during the 202014 flu season was prevented as a result of flu vaccination. Although influenza activity nationally is low compared to this time last season, it is increasing.
The 201220 flu season was particularly harsh in the united states, where the majority of states were reporting high rates of influenzalike illness. Seasonal effectiveness of live attenuated and inactivated. Data from the 200910 season was not used for baseline calculations due to the irregular pattern caused by the h1n1 pandemic. Epidemiology of influenza in pregnant women hospitalized. Influenza immunization for all health care personnel. Influenza a virus subtype h3n2 ah3n2 is a subtype of viruses that causes influenza flu. There are two main types of influenza that cause illness in people. Section 6 influenza and influenza like illness surveillance. In the influenza season summaries you find the ecdc main outputs during the influenza.
Influenzalike illness activity continues to decrease and is below the national baseline. Basic information about the 20152016 flu season cdc. Reported pediatric flu deaths for the season are high at 174. Households were instructed at enrollment and via weekly email reminders to report all acute respiratory illnesses in which. At the start of the 201415 season, the wiso was replaced by flu news europe, which is produced jointly with the who regional office for europe. In 2009, a novel influenza virus, influenza ah1n1pdm09, emerged. With an increasing number of organizations requiring influenza vaccination, coverage among health care personnel has risen to 75% in the 20 to 2014 influenza season but still remains below the healthy people 2020 objective of 90%. The 2015 16 season was less intense compared to the previous 201415 season, as indicated by comparing the peaks for ari and ili. About 3 to 5 million cases of severe flu illness and about 250 000 to 500 000 flu season deaths worldwide occur due to the influenza virus. The 201220 flu season was particularly harsh in the united states, where. Ohio department of health seasonal influenza activity.
Data from this report showed that the 2014 national flutracking influenza season was a moderately more intense season than 20. Influenzalike illness ili data were provided by the national sentinel influenza. This motivated columbias scientists to compare 1,688 diseases against the birth dates and medical histories of 1. Bureau of infectious disease control infectious disease. The final report of the 2014 influenza season was for the week ending march 15, 2014. The purpose of this statement is to reaffirm the american academy of pediatrics support for a mandatory influenza immunization policy for all health care personnel. Prim and proper marie hilley of anniston, alabama is left to fend for herself after a mysterious illness overtakes her husband. Vaccine effectiveness estimates and 95% confidence intervals were calculated with respect to patient. Influenza activity peaked in late december during the 202014 season and influenza a h1n1pdm09 viruses predominated, according to cdc data published in. Weekly influenza surveillance overview, weeks 25, 2014. Single detection of rsv, coronavirus, parainfluenza virus, and adenovirus was more likely during 2014. Flutracking is a national online community influenzalike illness ili surveillance system that monitors weekly ili activity and field vaccine effectiveness fve. Summary of the influenza 20142015 season in europe.
Influenza activity, surveillance and reports new york. Investigating the impact of influenza on excess mortality in all ages. Information on how these estimates are calculated can be found on cdcs web page how cdc estimates the burden of seasonal influenza in the u. Flu season is an annually recurring time period characterized by the prevalence of outbreaks of. Illness 20 illness is a story about the tragic fate of timothy, a thirteenyearold boy with a terrible mental illness, and the evergrowing fear of his parents, and their fight to protect their family. Flutracking weekly online community survey of influenza. The resulting pandemic disproportionately affected persons 2015. Compared with the previous five influenza seasons, the 20142015 season was moderately severe, with overall high levels of outpatient illness, high levels of hospitalization and a relatively high percentage of deaths attributed to pneumonia and influenza. Likewise, a larger proportion of outbreaks in facilities. In birds, humans, and pigs, the virus has mutated into many strains. This season was severe for people 65 and older especially.
1347 386 648 361 345 310 134 1096 497 934 1224 834 1498 853 591 985 1392 722 874 529 559 193 1388 1406 566 219 749 135 249 753 80 65 1461