Facebook Twitter LinkedIn Syndicate. Minus Related Pages. The gray area: highest and lowest number of norovirus outbreaks reported each week for the through seasonal years August—July. The green dotted line: data from the last seasonal year The solid red line: latest data for the current seasonal year More information about the current norovirus season: From August 1 — December 18, , there were 98 norovirus outbreaks reported by NoroSTAT-participating states.
These vaccine effectiveness estimates were derived from data collected from the U. See Seasonal Influenza Vaccine Effectiveness, for more information. Laboratory analysis of circulating flu viruses indicated that most of the influenza A H3N2 viruses were antigenically or genetically different than the influenza A H3N2 vaccine virus.
This is probably why there was reduced vaccine effectiveness against those drifted influenza A H3N2 viruses. However, the vaccine worked well against about one-third of circulating influenza A H3N2 viruses that were similar to the recommended vaccine virus and against influenza A H1N1 and influenza B viruses. Experts must pick which viruses to include in the vaccine many months in advance of the flu season in order for vaccine to be produced and delivered on time.
And flu viruses change constantly; they can change from one season to the next or they can even change within the course of one flu season.
Because of these factors, there is always the possibility of a less than optimal match between circulating viruses and the viruses in the vaccine. The drifted influenza A H3N2 viruses that circulated during the season were first detected during routine surveillance testing in late March , after World Health Organization WHO recommendations external icon for the vaccine composition for the Northern Hemisphere formulation of the vaccine were made in mid-February.
At that time, only a very small number of these viruses had been found among the thousands of specimens that had been collected and tested and there was no way to predict that they would circulate widely. CDC collaborates with other partners each season to assess how well the seasonal vaccines are working. During the season, CDC completed multiple studies on the effectiveness of both the flu shot and the nasal-spray flu vaccine.
These studies measured vaccine effectiveness in preventing laboratory-confirmed influenza among persons 6 months of age and older. CDC routinely collects and monitors flu viruses for changes through an established network of domestic and global surveillance systems.
One of the things that CDC looks for are changes in viruses that would make antiviral drugs less effective in treating or preventing infection. Additionally, CDC works with the state public health departments and the World Health Organization to collect additional information on antiviral resistance in the United States and worldwide.
The information collected will assist in making informed recommendations regarding use of antiviral drugs to treat influenza.
To receive weekly email updates about Seasonal Flu, enter your email address:. Skip directly to site content Skip directly to page options Skip directly to A-Z link.
Influenza Flu. Section Navigation. Facebook Twitter LinkedIn Syndicate. Summary of the Influenza Season. Minus Related Pages. On This Page. What CDC Does. To receive weekly email updates about Seasonal Flu, enter your email address: Email Address. What's this? Microsoft says it will reveal summary of F1 chiefs confirm they have launched a probe into controversial ending of the title-deciding Abu Dhabi Grand British Vogue debuts February issue featuring nine black women who are 'redefining what it means to be a Wearing a facemask makes you more attractive to the opposite sex, study finds Transgender activist Munroe Bergdorf is unveiled as Cosmopolitan UK's 50th anniversary cover star: Model Has 'prancing pony' Rishi Sunak overplayed his hand: Ambitious Chancellor is warned he risks damaging his No10 aides make sure Dilyn still gets his walkies as Boris isolates after family member Will row over BBC's coverage of partygate and Boris Johnson's apology cost the corporation in licence fee Mystery grows over murder of Irish primary school teacher, 23, 'who was beaten to death as she walked by Prince Andrew is stripped of his uniforms: The military finery that he will no longer be entitled to wear Prince Andrew may have to fund his own security after being stripped of his title, warns former head of From Falklands war hero to humiliation: Top Army figures tell of 'widespread relief' as Prince Andrew is Selfridges will become the world's first retailer to sell a range of Paco The spirits of our lost children came back to bring us comfort too: After Nicola Horlick revealed how her Is this going to be Ed's final resting place?
Queen takes Andrew's title: Duke of York won't use His Royal Highness 'officially', loses ALL of his military roles and royal patronages and is told he will have to face sex assault lawsuit as a 'private citizen' 'Can YOU imagine having to work with these truth twisters? Tiny Pomeranian puppy called Snowball becomes an online hit thanks to its incredibly cute photos BBC broadcaster John Stevenson's male partner in his 60s - who gave up work to care for the ailing journalist - died of heart attack trying to lift up the year-old's body when he died of natural causes 'Boris seems affronted when criticised for what amounts to a gross failure of responsibility': Letter goes viral from PM's Eton classics master re-emerges despairing about his year-old pupil's 'effortless superiority' Man claims he has lost 1.
0コメント