Avian influenza epidemiology and demographics: Difference between revisions
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==Overview== | ==Overview== | ||
The World Health Organization (WHO) reports an incidence of 3 to 5 million cases of severe influenza disease annually, including 250 000 to 500 000 deaths every year. The case fatality rate per outbreak is highly variable and may range from less than 1 to more than 200 per 100,000 cases. Influenza may infect patients of all age groups, but elderly patients > 65 years, young children (especially patients < 2 years of age), and | The [[World Health Organization]] (WHO) reports an incidence of 3 to 5 million cases of severe influenza disease annually, including 250,000 to 500,000 deaths every year. The [[case fatality rate]] per outbreak is highly variable and may range from less than 1 to more than 200 per 100,000 cases. Influenza may infect patients of all age groups, but [[elderly]] patients > 65 years, young [[children]] (especially patients < 2 years of age), and [[adolescent]]s are at high risk of developing [[Avian influenza natural history, complications and prognosis|complication]]s and [[death]]. There is no racial or gender predilection for avian influenza infection. | ||
==Epidemiology and Demographics== | ==Epidemiology and Demographics== | ||
===Incidence=== | ===Incidence=== | ||
*The incidence of avian influenza is difficult to extrapolate from the annual incidence of influenza in general. | *The incidence of avian influenza is difficult to extrapolate from the annual incidence of influenza in general. | ||
*The World Health Organization (WHO) reports an incidence of 3 to 5 million cases of severe influenza disease annually, including 250 000 to 500 000 deaths every year.[1] | *The [[World Health Organization]] (WHO) reports an incidence of 3 to 5 million cases of severe influenza disease annually, including 250,000 to 500,000 deaths every year.[1] | ||
*The annual incidence may vary significantly depending on whether an influenza outbreak occurs or not. | *The annual [[incidence]] may vary significantly depending on whether an influenza outbreak occurs or not. | ||
*During | *During [[outbreak]]s, the influenza may infect millions of individuals with an annual [[mortality rate]] that ranges between 15,000 (in 2009 influenza pandemic) and 100 million (in 1918 influenza pandemic). | ||
*The case fatality rate per outbreak is also highly variable and may range from less than 1 to more than 200 per 100,000 cases. | *The [[case fatality rate]] per outbreak is also highly variable and may range from less than 1 to more than 200 per 100,000 cases. | ||
===Age=== | ===Age=== | ||
*Influenza, including avian influenza, may infect patients of all age groups. | *Influenza, including avian influenza, may infect patients of all age groups. | ||
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*Determination of specific at-risk patient populations depends on the virus subtype. | *Determination of specific at-risk patient populations depends on the virus subtype. | ||
*High risk populations are elderly > 65 years, young children (especially patients < 2 years of age), and | *High risk populations are [[elderly]] > 65 years, young [[children]] (especially patients < 2 years of age), and [[adolescent]]s. | ||
===Race=== | ===Race=== | ||
Revision as of 17:48, 23 April 2015
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Risk calculators and risk factors for Avian influenza epidemiology and demographics |
Editor-In-Chief: C. Michael Gibson, M.S., M.D. [1]; Associate Editor(s)-in-Chief: Yazan Daaboul, M.D.
Overview
The World Health Organization (WHO) reports an incidence of 3 to 5 million cases of severe influenza disease annually, including 250,000 to 500,000 deaths every year. The case fatality rate per outbreak is highly variable and may range from less than 1 to more than 200 per 100,000 cases. Influenza may infect patients of all age groups, but elderly patients > 65 years, young children (especially patients < 2 years of age), and adolescents are at high risk of developing complications and death. There is no racial or gender predilection for avian influenza infection.
Epidemiology and Demographics
Incidence
- The incidence of avian influenza is difficult to extrapolate from the annual incidence of influenza in general.
- The World Health Organization (WHO) reports an incidence of 3 to 5 million cases of severe influenza disease annually, including 250,000 to 500,000 deaths every year.[1]
- The annual incidence may vary significantly depending on whether an influenza outbreak occurs or not.
- During outbreaks, the influenza may infect millions of individuals with an annual mortality rate that ranges between 15,000 (in 2009 influenza pandemic) and 100 million (in 1918 influenza pandemic).
- The case fatality rate per outbreak is also highly variable and may range from less than 1 to more than 200 per 100,000 cases.
Age
- Influenza, including avian influenza, may infect patients of all age groups.
- Determination of specific at-risk patient populations depends on the virus subtype.
- High risk populations are elderly > 65 years, young children (especially patients < 2 years of age), and adolescents.
Race
- There is no racial predilection for avian influenza infection.
Gender
- There is no gender predilection for avian influenza infection.