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Influenza | The BMJ

09 Dic

#### What you need to know The World Health Organisation estimates that approximately one billion people are infected and up to 500 000 people die from influenza each year.1 The greatest burden of illness usually occurs among children, while the highest burden of severe disease (in terms of hospitalisation and death) occurs in those with underlying medical conditions, infants and young children, and elderly people.2 Current circulating influenza strains in humans include influenza A(H1N1)pdm09, influenza A(H3N2), and both influenza B viruses (B/Victoria and B/Yamagata).3 4 This article provides non-specialists with information on how to diagnose, manage, and prevent flu. There are four types of influenza viruses: influenza A, B, C, and D,3 4 5 6 but only influenza A and B viruses cause clinically important human disease and seasonal epidemics (table 1⇓).1 Influenza A viruses cause the most severe clinical disease and are the commonest cause of seasonal epidemics and pandemics in human populations.1 View this table: Table 1 Influenza viruses Influenza is characterised by sudden onset of fever, myalgia, headache, malaise, dry cough, sore throat, and nasal congestion (fig 1⇓).13 14 15 Gastrointestinal symptoms including nausea, vomiting and diarrhoea are also common.16 The incubation period of influenza (time from infection to development of symptoms) is 1 to 4 days. …

Sorgente: Influenza | The BMJ

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Pubblicato da su 9 dicembre 2016 in epidemiologia

 

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