For at least 40-60 seconds each time, especially after coughing or sneezing. It makes the eye appear pink or reddish. rhinovirus, respiratory syncytial virus, parainfluenza and adenovirus can also present as Influenza-like Illness (ILI) which makes the clinical differentiation of influenza from other pathogens difficult. Seasonal influenza is characterized by a sudden onset of fever, cough (usually dry), headache, muscle and joint pain, severe malaise (feeling unwell), sore throat and a runny nose. Thompson WW, Shay DK, Weintraub E, et al. At irregular intervals there are influenza pandemics. Summary information on antiviral resistance from influenza viruses in Europe is published in the weekly influenza update Flu News Europe. Type B infections are less common and usually milder than influenza A(H3N2). MacIntyre CR, Epid MA, Cauchemez S, Dwyer DE, Seale H, Cheung P, et al. Additionally, aerosol transmission plays a part in influenza virus transmission. Collection of appropriate respiratory samples and the application of a laboratory diagnostic test is required to establish a definitive diagnosis. Vaccination is the most effective form of influenza prevention. Minor illnesses are the most common causes of nasal congestion. The incubation time for seasonal influenza is on average two days, but ranges from one to four days. The cough can be severe and can last 2 or more weeks. Cowling B, Chan K-H, Fang VJ, Cheun CYK, Fung ROP, Wai W. et al. Facemasks and hand hygiene to prevent influenza transmission in households: a cluster randomized trial Annals of Internal medicine 2009; 151: 437-446. Although vaccination is the preferred option for preventing influenza, antivirals can be useful when the vaccine fails or is unavailable, for example, due to: antigenic mismatch with circulating virus, waning immunity in elderly, patient being immunocompromised, the vaccine not yet available, or during an outbreak of an emerging influenza strain or pandemic. Congestion is when your nose becomes stuffed up and inflamed. Read more about avian influenza and swine influenza. The network combines epidemiological and virological surveillance of influenza. Thompson WW, Weintraub E, Dhankhar P, Cheng OY, Brammer L, Meltzer MI, et al. Neuraminidase inhibitors, oral oseltamivir and inhaled zanamivir, are useful for treatment and prophylactic use. • Seasonal influenza vaccination is available for anyone aged 6 months and over to protect against influenza, provided they do not have a medical reason that precludes them from receiving influenza vaccines. However, the level of virus shedding before symptoms start is lower than for a few days after. Swelling of the white part … 7. The diagnosis can be confirmed by taking specimens for laboratory analysis. chemotherapy). Influenza viruses are usually classified into three types: A, B and C, according to differences in antigenic and biologic properties. While the beginning of major flu activity in each season varies by location, in any specific location these minor epidemics usually take about three weeks to reach its pinnacle, and another 3 weeks to significantly diminish. Influenza A. Health care workers are at high risk acquiring influenza virus infection due to increased exposure to the patients and risk further spread particularly to vulnerable individuals. through inclusion of HA and NA subtypes from avian or swine origin by re-assortment, i.e. Administration of the drug should also be considered in patients presenting later in the course of illness. Each year, influenza causes serious infection and death around the globe, usually in the winter months (seasonal influenza). Epub 2012 Sep 13. Zhou H, Thompson WW, Viboud CG, et al. Hospitalizations associated with influenza and respiratory syncytial virus in the United States, 1993-2008. Clin Infect Dis. Euro Surveill. Firstly there is the severe disease and deaths. BMC Infectious Diseases. Regular hand washing with proper drying of the hands. Skip directly to site content Skip directly to page options Skip directly to A-Z link. WHO works to strengthen national, regional and global influenza response capacities including diagnostics, antiviral susceptibility monitoring, disease surveillance and outbreak responses, and to increase vaccine coverage among high risk groups and prepare for the next influenza pandemic. Read more in Influenza-related deaths - available methods for estimating numbers and detecting patterns for seasonal and pandemic influenza in Europe (Nicoll et al., 2012). Influenza activity can sometimes be predicted and even tracked geographically. The time from infection to illness, known as the incubation period, is about 2 days, but ranges from one to four days. Diagnosis of influenza in children is discussed separately. Available from http://www.cdc.gov/EID/content/15/2/233.htm. Moreover, some people become infected, shed virus, yet are subclinical or asymptomatic cases - their role in transmission is not conclusively determined. WHO GISRS monitors resistance to antivirals among circulating influenza viruses to provide timely guidance for antiviral use in clinical management and potential chemoprophylaxis. The diagnosis of seasonal influenza in adults will be reviewed here. The tests performed in laboratories include RT-PCR, enzyme-linked immunoassay, immunofluorescence, and virus culture. However, when flu is widespread in the community, the diagnosis is often presumed without laboratory testing, by simply identifying patients with typical symptoms of influenza-like illness (ILI).Â. Estimating influenza-related excess mortality and reproduction numbers for seasonal influenza in Norway, 1975–2004. ].An incorrect word in a sentence in Escherichia coli O157 Outbreaks in the United States, 2003–2012 (K.E. 21, PMID: 26197993. Thompson WW, Weintraub E, Dhankhar P, Cheng OY, Brammer L, Meltzer MI, et al. Emerg Infect Dis. the exchange of at least one RNA segment. Textbook of Influenza. Exercises for Sleep Apnea, Snoring, Sinus Pressure & more. 2009;3:37-49. inadvertently changed the meaning. However these tests generally have a low sensitivity but high specificity, and do not allow subtype determination. Sporadic infections occur outside of the influenza season, though the incidence is very low in the European summer when infections may be the result of imported cases from equatorial areas (where transmission is more year round) and the southern hemisphere where most infection takes place between June to October. Most people recover from fever and other symptoms within a week without requiring medical attention. Although vaccination is the preferred option for preventing influenza, antivirals can be useful when the vaccine fails. These should target uptake of seasonal influenza vaccination and also perceptions of risk and beliefs about the efficacy and safety of pandemic influenza vaccinations. At any one time there is a mix of influenza viruses circulating in the human population. Type B viruses cause somewhat less severe disease and tend to cause fewer complications than some type A viruses. Apart from assisting in diagnosing the patient, the collected influenza virus specimens also provide material for characterization of viruses and contribute to seasonal vaccine development. cdc:32653[This corrects the article on p. 1293 in vol. Influenza A can also be transmitted interchangeably between humans and swine, and from birds to humans. If the infected person doesn’t cover his or her mouth and nose people within a range of two meters can be infected. Seasonal influenza causes 4 -50 million symptomatic cases in EU/EEA each year, and 15 000 – 70 000 European citizens die every year of causes associated with influenza. It may e.g. Severe disease may also include myocarditis or encephalitis, which may be fatal. Viral shedding continues for a somewhat longer period in young children, elderly, and those who have weakened immune systems, compared to adults. Most simple seasonal influenza cases are managed symptomatically and are advised bedrest at home to minimize the risk for infecting others in the community. Seasonal influenza is a preventable infectious disease with mostly respiratory symptoms. Due to the high resistance (>99%) adamantanes are no longer recommended. Various guidance on the laboratory techniques is published and updated by WHO. 2014;42(11):2325-32. In 2011, a live attenuated influenza vaccine was also approved in the EU for children and adolescents.Â, The European seasonal influenza vaccination approach is generally to reduce the risk of people at greater risk of complications when infected.Â, In 2003 The World Health Assembly, which includes all EU/EEA countries, lent its support to targets for vaccination uptake in the elderly of 50% by 2006 and 75% by 2010. When an infected person coughs or sneezes, droplets containing viruses (infectious droplets) are dispersed into the air and can spread up to one meter, and infect persons in close proximity who breathe these droplets in. Lancet 2011; 378: 1917–3 Influenza vaccine is most effective when circulating viruses are well-matched with viruses contained in vaccines. Louie JK, Yang S, Acosta M, et al. Treatment with neuraminidase inhibitors for critically ill patients with influenza A (H1N1)pdm09. Clin Infect Dis. Seasonal influenza is an acute respiratory infection caused by influenza viruses which circulate in all parts of the world. 2005 Jun 21;2:6. Seasonal influenza affects about 5–20% of the population each year. Starting with the 2013–2014 northern hemisphere influenza season, a 4th component is recommended to support quadrivalent vaccine development. ivEur. conditions and treatments that suppress the immune function (e.g. Description. Burden of seasonal influenza hospitalization in children, United States, 2003 to 2008. J Pediatr. 2010;157(5):808-14. The burden of influenza-associated critical illness hospitalizations. Influenza A viruses are further divided into subtypes. Herpes zoster: seasonal variations and morphological patterns in Pakistan "Overall in the temperate regions of the northern hemisphere (North America and Europe), pandemic and seasonal influenza viruses have been detected only sporadically or at very low levels during the past month," it added. There is also evidence of a fourth type: D (Ducatez, 2015). Uncomplicated seasonal influenza disease presents as rapid onset of the following combination of systemic and respiratory symptoms: Children may also present with gastrointestinal symptoms such as vomiting or diarrhea, apart from fever and respiratory symptoms. The level of antiviral resistance is closely followed by public health authorities. Lancet 2011; 378: 1917–3, WHO SAGE Seasonal Influenza Vaccination Recommendations during the COVID-19 Pandemic, World Health Assembly Update, 24 May 2019, WHO launches new global influenza strategy, Through a structured and coordinated response, Colombia seeks to leave no one behind in the fight against COVID-19, 8 Things to know about pandemic influenza, Coronavirus disease outbreak (COVID-2019), Coronavirus disease outbreak (COVID-19) ». Kramarz P (2009), Monnet D, Nicoll A, Yilmaz C, Ciancio B. Use of oseltamivir in 12 European countries between 2002 and 2007 – lack of association with the appearance of oseltamivir-resistant influenza A(H1N1) viruses. In the northern hemisphere, including Europe, seasonal influenza generally occurs in epidemics between November and April each year, and in the southern hemisphere between June and October. iii: and the relevant Ph. Euro Surveill. Seasonal influenza is a vaccine-preventable disease that each year infects approximately 10 to 30 % of Europe's population, and causes hundreds of thousands of hospitalisations across Europe. During a typical influenza season it has been estimated that approximately 75% of the seasonal influenza infections are asymptomatic (Hayward, 2014).Â. Overall, it is hard to control seasonal influenza. Furthermore, exacerbations of underlying disease, e.g. Neuraminidase inhibitors (i.e. However, immunity to influenza viruses and vaccines wane over time and a large part of the population is susceptible each season. Influenza spreads predominantly via the droplet and contact routes when people cough and sneeze, and by indirect spread through respiratory secretions on hands, tissues, etc. Hands should be washed thoroughly with soap and water, and dried. Influenza-related deaths – available methods for estimating numbers and detecting patterns for seasonal and pandemic influenza in Europe. Face mask use and control of respiratory virus transmission in households. Laboratory confirmation of influenza virus from throat, nasal and nasopharyngeal secretions or tracheal aspirate or washings is commonly performed using direct antigen detection, virus isolation, or detection of influenza-specific RNA by reverse transcriptase-polymerase chain reaction (RT-PCR). Apart from vaccination and antiviral treatment, the public health management includes personal protective measures like: WHO, through the WHO GISRS system, in collaboration with other partners, monitors influenza activity globally, recommends seasonal influenza vaccine compositions twice a year for the Northern and Southern hemisphere influenza seasons, guides countries in tropical and subtropical areas to choose vaccine formulations (Northern hemisphere vs. Southern hemisphere), to support decisions for timing of vaccination campaigns, and to support Member States to develop prevention and control strategies. The flu, or influenza, is a highly contagious viral infection that mainly affects the respiratory system. There is some evidence supporting that surgical masks worn by ill people may reduce infections among close contacts when influenza is circulating. ECDC continues to emphasise that all Europeans who are recommended to have the influenza vaccine should get vaccinated. 2012; 17(18):pii: 20162. coronary artery disease);Â, chronic kidney diseases (e.g. Moreover, only influenza type A viruses are responsible for the occasional pandemics. Cowling BJ, Fung ROP, Cheng CKY, Fang VJ, Chan KH, et al. (2008) Preliminary Findings of a Randomized Trial of Non-Pharmaceutical Interventions to Prevent Influenza Transmission in Households. 2014;2(6):445-54. In the U.S. alone, annual deaths caused by flu range from 3,300 to 48,600 people, and more than 200,000 are hospitalized each year from flu-related complications. People at greater risk of severe disease or complications when infected are: pregnant women, children under 59 months, the elderly, individuals with chronic medical conditions (such as chronic cardiac, pulmonary, renal, metabolic, neurodevelopmental, liver or hematologic diseases) and individuals with immunosuppressive conditions (such as HIV/AIDS, receiving chemotherapy or steroids, or malignancy). WHO recommended surveillance standards, Second edition. Early estimates of the excess mortality associated with the 2008-9 influenza season in Portugal. Zucs P, Buchholz U, Haas W, Uphoff H. Influenza-associated excess mortality in Germany, 1985-2001. This results in gradual changes of the human seasonal influenza viruses. All age groups can be affected but there are groups that are more at risk than others. Emerg Infect Dis. A total of 664 hospital admissions and 85 confirmed deaths have been reported since the beginning of winter 2017. consist of swabbing the nose and nasal cavity. However, among the elderly, influenza vaccination may be less effective in preventing illness but reduces severity of disease and incidence of complications and deaths. Influenza A and influenza B cause seasonal epidemics in the United States and elsewhere every winter. For the best clinical benefit, treatment with antivirals should be given early in the infection, within 48 hours, (the earlier the better). Influenza activity in Europe during eight seasons (1999-2007): an evaluation of the indicators used to measure activity and an assessment of the timing, length and spread across Europe. Adults who are admitted to hospitals are often taken to critical care wards and between 3% to 15% die in hospital. Treatment is recommended for a minimum of 5 days, but can be extended until there is satisfactory clinical improvement. In temperate climates, seasonal epidemics occur mainly during winter, while in tropical regions, influenza may occur throughout the year, causing outbreaks more irregularly. In temperate climates, seasonal epidemics occur mainly during winter while in tropical regions, influenza … In terms of transmission, seasonal influenza spreads easily, with rapid transmission in crowded areas including schools and nursing homes. Jefferson T, et al. Physical interventions to interrupt or reduce the spread of respiratory viruses: systematic review. Since the most recent influenza pandemic in 2009 seasonal influenza consists of variable mixes of influenza A(H3N2), A(H1N1)pdm09 - the latter caused the 2009 pandemic, and the two B virus lineages. Avoiding close contact with sick people, e.g. Learn more. But, since 2009 the majority of the circulating influenza A viruses are resistant to the adamantane compounds. All currently circulating influenza viruses are, children aged between 6 months to 5 years, elderly individuals (aged more than 65 years), individuals with chronic medical conditions, Regular hand washing with proper drying of the hands, Good respiratory hygiene – covering mouth and nose when coughing or sneezing, using tissues and disposing of them correctly, Early self-isolation of those feeling unwell, feverish and having other symptoms of influenza, Avoiding touching one’s eyes, nose or mouth. The use of these drugs is very variable between European countries (Kramarz et al., 2009), as are the policies.Â. A single acute serum specimen for seasonal influenza serology is uninterpretable and should not be collected. Post-exposure prophylaxis with influenza antivirals, for example for an at-risk unvaccinated person, is dependent on timely prescription given that the incubation period is 1-4 days. Among viruses that infect humans influenza is moderately infectious. Safe and effective vaccines are available and have been used for more than 60 years. The subtypes are determined by two glycoproteins on the virus surface, haemagglutinin (HA) (H1–H18) and neuraminidase (NA) (N1–N11). Gran JM, Iversen B, Hungnes O, et al. Estimating influenza-related excess mortality and reproduction numbers for seasonal influenza in Norway, 1975–2004; Epidemiol Infect. Despite the often short duration of illness, the yearly economic and healthcare burden of influenza is substantial. These usually affect most of the countries for one to two months and last in Europe for about four months overall (Paget et al., 2007). Requiring medical attention compounds ( amantadine and rimantadine ), act as M2 inhibitors and are active against.... Person doesn’t cover his or her mouth and nose when coughing, and from to. Beliefs about the classification of influenza transmission. influenza other Respir viruses the preferred option preventing! 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