<s id="NEST_Infno.s1">Influensa gir feber og smerter i hele kroppen.</s> <s id="NEST_Inf_154en.s1">Influenza, or the flu, causes fever and pains throughout the body.</s>

<s id="NEST_Infno.s2">Vanligvis blir mellom fem og ti prosent av befolkningen syke i løpet av en vintersesong.</s> <s id="NEST_Inf_154en.s2">Typically, between five and ten percent of the population will catch the flu through the course of a winter.</s>

<s id="NEST_Infno.s3">Viruset kan enkelte år gi verdensomspennende epidemier med mange dødsfall og er derfor under nøye overvåkning.</s> <s id="NEST_Inf_154en.s3">Occasionally, the virus may cause global epidemics with high death rates, and it is thus kept under careful surveillance.</s>

<s id="NEST_Infno.s4">Faglig revidert: 26.06.2007.</s> <s id="NEST_Inf_154en.s4">Technically revised: 26.06.2007.</s>

<s id="NEST_Infno.s5">Lenker vedr. influensa A(H1N1) – svineinfluensa langt til 30.04.2009.</s> <s id="NEST_Inf_154en.s5">Links regarding influenza A(H1N1) – swine flu added 30.4.2009.</s>

<s id="NEST_Inf_154en.s6">Treatment paragraph updated 27.11.2009.</s>

<s id="NEST_Infno.s6">Oppdatert avsnitt vaksine 22.12.2010.</s> <s id="NEST_Inf_154en.s7">Updated vaccine paragraph 22.12.2010.</s>

<s id="NEST_Infno.s7">Hvert år i perioden desember til april rammes befolkningen på den nordlige halvkule av smittsomme influensaepidemier.</s> <s id="NEST_Inf_154en.s8">Every year during the period from December to April, the population of the northern hemisphere is struck with contagious influenza epidemics.</s>

<s id="NEST_Infno.s8">Dette kalles sesonginfluensa.</s> <s id="NEST_Inf_154en.s9">This is called seasonal influenza.</s>

<s id="NEST_Infno.s9">De vanligste influensatypene som gir epidemier, er type A og B.</s> <s id="NEST_Inf_154en.s10">The most common types of influenza to cause epidemics, are types A and B.</s>

<s id="NEST_Infno.s10">Nye varianter av type A og B kommer hvert år.</s> <s id="NEST_Inf_154en.s11">New variants of the types A and B occur every year.</s>

<s id="NEST_Infno.s11">Nye stammer får navn etter stedet hvor de først ble oppdaget, f.eks type A/Sydney.</s> <s id="NEST_Inf_154en.s12">New subtypes are named after the place where they were first discovered, for instance type A/Sydney.</s>

<s id="NEST_Infno.s12">Influensa kommer av det latinske ordet influere – flyte inn.</s> <s id="NEST_Inf_154en.s13">Influenza comes from the Latin word influere – to flow in.</s>

<s id="NEST_Infno.s13">Spesielt om influensa A(H1N1) – svineinfluensa, se rammen til høyre.</s> <s id="NEST_Inf_154en.s14">For further reading about influenza A(H1N1) – swine flu, see the text box on the right.</s>

<s id="NEST_Infno.s14">Influensa A(H1N1) – svineinfluensa</s> <s id="NEST_Inf_154en.s15">Influenza A(H1N1) – swine flu</s>

<s id="NEST_Infno.s15">- Se spørsmål og svar</s> <s id="NEST_Inf_154en.s16">* See questions and answers</s>

<s id="NEST_Infno.s16">- Se temaside</s> <s id="NEST_Inf_154en.s17">* See subject page</s>

<s id="NEST_Infno.s17">Fugleinfluensa</s> <s id="NEST_Inf_154en.s18">Bird flu</s>

<s id="NEST_Infno.s18">Fugle-influensa smitter sjelden til mennesker.</s> <s id="NEST_Inf_154en.s19">Bird flu is rarely infectious for humans.</s>

<s id="NEST_Infno.s19">Men dersom det skjer, og disse menneskene samtidig smittes av vanlig influensa, kan infiserte celler i kroppen produsere en krysning mellom de to virusene.</s> <s id="NEST_Inf_154en.s20">But if an infection does occur, and one is also infected by a more common type of the flu, the infected cells in the body may produce a hybrid of the two viruses.</s>

<s id="NEST_Infno.s20">Da kan vi teoretisk få et nytt virus som få eller ingen er immune mot.</s> <s id="NEST_Inf_154en.s21">Theoretically, we may then see a new virus, one which few or no one is immune to.</s>

<s id="NEST_Infno.s21">Historie</s> <s id="NEST_Inf_154en.s22">History</s>

<s id="NEST_Infno.s22">Til sammen 18 verdensomfattende influensaepidemier er kjent fra historien.</s> <s id="NEST_Inf_154en.s23">Altogether, 18 global influenza epidemics are known throughout history.</s>

<s id="NEST_Infno.s23">Den første pandemien ble beskrevet i 1580.</s> <s id="NEST_Inf_154en.s24">The first pandemic was described in 1580.</s>

<s id="NEST_Infno.s24">Den største var Spanskesyken i 1918-1919, som førte til 25-40 millioner dødsfall i verden.</s> <s id="NEST_Inf_154en.s25">The deadliest was the Spanish Flu in 1918-19, which caused 25-40 million deaths throughout the world.</s>

<s id="NEST_Infno.s25">I Norge døde ca. 15 000 personer.</s> <s id="NEST_Inf_154en.s26">Approximately 15,000 people died in Norway.</s>

<s id="NEST_Infno.s26">De to siste større pandemiene var Asiasyken i 1957 og Hong Kong-syken i 1968.</s> <s id="NEST_Inf_154en.s27">The two most recent larger pandemics were the Asian Flu in 1957 and the Hong Kong flu in 1968.</s>

<s id="NEST_Infno.s27">Influensavirus av type A ble første gang påvist i 1933 og type B i 1940.</s> <s id="NEST_Inf_154en.s28">Type A influenza viruses were first traced in 1933, and type B in 1940.</s>

<s id="NEST_Infno.s28">På slutten av 1940-tallet ble den første vaksinen utviklet.</s> <s id="NEST_Inf_154en.s29">In the end of the 1940s, the first vaccine was developed.</s>

<s id="NEST_Infno.s29">Dråpe- og kontaktsmitte</s> <s id="NEST_Inf_154en.s30">Infection</s>

<s id="NEST_Infno.s30">Influensa smitter hvis man puster inn dråper med influensavirus fra smittede personer som hoster eller nyser, såkalt nærdråpesmitte.</s> <s id="NEST_Inf_154en.s31">Influenza spreads through the breathing in of virus infected droplets from the cough or sneeze of an infected person.</s>

<s id="NEST_Infno.s31">Man kan også smittes ved direkte kontakt.</s> <s id="NEST_Inf_154en.s32">One may also catch the virus through direct touch.</s>

<s id="NEST_Infno.s32">En liten smittedose er nok for å gi sykdom.</s> <s id="NEST_Inf_154en.s33">A small infectious dose is enough to cause illness.</s>

<s id="NEST_Infno.s33">Inkubasjonstiden fra smitte til symptomer er vanligvis to dager, men varierer fra en til tre dager.</s> <s id="NEST_Inf_154en.s34">The incubation period from one is infected until symptoms start showing is typically two days, but may vary from one to three days.</s>

<s id="NEST_Infno.s34">Man er smitteførende fra den dagen symptomene viser seg og i tre-fem dager etterpå.</s> <s id="NEST_Inf_154en.s35">One is infectious from the day the symptoms start showing, and for three to five days following.</s>

<s id="NEST_Infno.s35">Når man har gjennomgått influensasykdom med én virusstamme, er man vanligvis immun i mange år etterpå mot denne stammen.</s> <s id="NEST_Inf_154en.s36">Following an influenza infection of one subtype, one is typically immune to this particular subtype for several years.</s>

<s id="NEST_Infno.s36">Man kan også være immun mot lignende stammer, såkalt kryssimmunitet.</s> <s id="NEST_Inf_154en.s37">One may also be immune to similar subtypes, through what is known as cross-immunity.</s>

<s id="NEST_Infno.s1">Influensa gir feber og smerter i hele kroppen.</s>	<s id="NEST_Inf_154en.s1">Influenza, or the flu, causes fever and pains throughout the body.</s>
<s id="NEST_Infno.s2">Vanligvis blir mellom fem og ti prosent av befolkningen syke i løpet av en vintersesong.</s>	<s id="NEST_Inf_154en.s2">Typically, between five and ten percent of the population will catch the flu through the course of a winter.</s>
<s id="NEST_Infno.s3">Viruset kan enkelte år gi verdensomspennende epidemier med mange dødsfall og er derfor under nøye overvåkning.</s>	<s id="NEST_Inf_154en.s3">Occasionally, the virus may cause global epidemics with high death rates, and it is thus kept under careful surveillance.</s>
<s id="NEST_Infno.s4">Faglig revidert: 26.06.2007.</s>	<s id="NEST_Inf_154en.s4">Technically revised: 26.06.2007.</s>
<s id="NEST_Infno.s5">Lenker vedr. influensa A(H1N1) – svineinfluensa langt til 30.04.2009.</s>	<s id="NEST_Inf_154en.s5">Links regarding influenza A(H1N1) – swine flu added 30.4.2009.</s>
	<s id="NEST_Inf_154en.s6">Treatment paragraph updated 27.11.2009.</s>
<s id="NEST_Infno.s6">Oppdatert avsnitt vaksine 22.12.2010.</s>	<s id="NEST_Inf_154en.s7">Updated vaccine paragraph 22.12.2010.</s>
<s id="NEST_Infno.s7">Hvert år i perioden desember til april rammes befolkningen på den nordlige halvkule av smittsomme influensaepidemier.</s>	<s id="NEST_Inf_154en.s8">Every year during the period from December to April, the population of the northern hemisphere is struck with contagious influenza epidemics.</s>
<s id="NEST_Infno.s8">Dette kalles sesonginfluensa.</s>	<s id="NEST_Inf_154en.s9">This is called seasonal influenza.</s>
<s id="NEST_Infno.s9">De vanligste influensatypene som gir epidemier, er type A og B.</s>	<s id="NEST_Inf_154en.s10">The most common types of influenza to cause epidemics, are types A and B.</s>
<s id="NEST_Infno.s10">Nye varianter av type A og B kommer hvert år.</s>	<s id="NEST_Inf_154en.s11">New variants of the types A and B occur every year.</s>
<s id="NEST_Infno.s11">Nye stammer får navn etter stedet hvor de først ble oppdaget, f.eks type A/Sydney.</s>	<s id="NEST_Inf_154en.s12">New subtypes are named after the place where they were first discovered, for instance type A/Sydney.</s>
<s id="NEST_Infno.s12">Influensa kommer av det latinske ordet influere – flyte inn.</s>	<s id="NEST_Inf_154en.s13">Influenza comes from the Latin word influere – to flow in.</s>
<s id="NEST_Infno.s13">Spesielt om influensa A(H1N1) – svineinfluensa, se rammen til høyre.</s>	<s id="NEST_Inf_154en.s14">For further reading about influenza A(H1N1) – swine flu, see the text box on the right.</s>
<s id="NEST_Infno.s14">Influensa A(H1N1) – svineinfluensa</s>	<s id="NEST_Inf_154en.s15">Influenza A(H1N1) – swine flu</s>
<s id="NEST_Infno.s15">- Se spørsmål og svar</s>	<s id="NEST_Inf_154en.s16">* See questions and answers</s>
<s id="NEST_Infno.s16">- Se temaside</s>	<s id="NEST_Inf_154en.s17">* See subject page</s>
<s id="NEST_Infno.s17">Fugleinfluensa</s>	<s id="NEST_Inf_154en.s18">Bird flu</s>
<s id="NEST_Infno.s18">Fugle-influensa smitter sjelden til mennesker.</s>	<s id="NEST_Inf_154en.s19">Bird flu is rarely infectious for humans.</s>
<s id="NEST_Infno.s19">Men dersom det skjer, og disse menneskene samtidig smittes av vanlig influensa, kan infiserte celler i kroppen produsere en krysning mellom de to virusene.</s>	<s id="NEST_Inf_154en.s20">But if an infection does occur, and one is also infected by a more common type of the flu, the infected cells in the body may produce a hybrid of the two viruses.</s>
<s id="NEST_Infno.s20">Da kan vi teoretisk få et nytt virus som få eller ingen er immune mot.</s>	<s id="NEST_Inf_154en.s21">Theoretically, we may then see a new virus, one which few or no one is immune to.</s>
<s id="NEST_Infno.s21">Historie</s>	<s id="NEST_Inf_154en.s22">History</s>
<s id="NEST_Infno.s22">Til sammen 18 verdensomfattende influensaepidemier er kjent fra historien.</s>	<s id="NEST_Inf_154en.s23">Altogether, 18 global influenza epidemics are known throughout history.</s>
<s id="NEST_Infno.s23">Den første pandemien ble beskrevet i 1580.</s>	<s id="NEST_Inf_154en.s24">The first pandemic was described in 1580.</s>
<s id="NEST_Infno.s24">Den største var Spanskesyken i 1918-1919, som førte til 25-40 millioner dødsfall i verden.</s>	<s id="NEST_Inf_154en.s25">The deadliest was the Spanish Flu in 1918-19, which caused 25-40 million deaths throughout the world.</s>
<s id="NEST_Infno.s25">I Norge døde ca. 15 000 personer.</s>	<s id="NEST_Inf_154en.s26">Approximately 15,000 people died in Norway.</s>
<s id="NEST_Infno.s26">De to siste større pandemiene var Asiasyken i 1957 og Hong Kong-syken i 1968.</s>	<s id="NEST_Inf_154en.s27">The two most recent larger pandemics were the Asian Flu in 1957 and the Hong Kong flu in 1968.</s>
<s id="NEST_Infno.s27">Influensavirus av type A ble første gang påvist i 1933 og type B i 1940.</s>	<s id="NEST_Inf_154en.s28">Type A influenza viruses were first traced in 1933, and type B in 1940.</s>
<s id="NEST_Infno.s28">På slutten av 1940-tallet ble den første vaksinen utviklet.</s>	<s id="NEST_Inf_154en.s29">In the end of the 1940s, the first vaccine was developed.</s>
<s id="NEST_Infno.s29">Dråpe- og kontaktsmitte</s>	<s id="NEST_Inf_154en.s30">Infection</s>
<s id="NEST_Infno.s30">Influensa smitter hvis man puster inn dråper med influensavirus fra smittede personer som hoster eller nyser, såkalt nærdråpesmitte.</s>	<s id="NEST_Inf_154en.s31">Influenza spreads through the breathing in of virus infected droplets from the cough or sneeze of an infected person.</s>
<s id="NEST_Infno.s31">Man kan også smittes ved direkte kontakt.</s>	<s id="NEST_Inf_154en.s32">One may also catch the virus through direct touch.</s>
<s id="NEST_Infno.s32">En liten smittedose er nok for å gi sykdom.</s>	<s id="NEST_Inf_154en.s33">A small infectious dose is enough to cause illness.</s>
<s id="NEST_Infno.s33">Inkubasjonstiden fra smitte til symptomer er vanligvis to dager, men varierer fra en til tre dager.</s>	<s id="NEST_Inf_154en.s34">The incubation period from one is infected until symptoms start showing is typically two days, but may vary from one to three days.</s>
<s id="NEST_Infno.s34">Man er smitteførende fra den dagen symptomene viser seg og i tre-fem dager etterpå.</s>	<s id="NEST_Inf_154en.s35">One is infectious from the day the symptoms start showing, and for three to five days following.</s>
<s id="NEST_Infno.s35">Når man har gjennomgått influensasykdom med én virusstamme, er man vanligvis immun i mange år etterpå mot denne stammen.</s>	<s id="NEST_Inf_154en.s36">Following an influenza infection of one subtype, one is typically immune to this particular subtype for several years.</s>
<s id="NEST_Infno.s36">Man kan også være immun mot lignende stammer, såkalt kryssimmunitet.</s>	<s id="NEST_Inf_154en.s37">One may also be immune to similar subtypes, through what is known as cross-immunity.</s>