Gravide kvinder er fire gange større sandsynlighed end den almindelige befolkning, der skal indlægges ved HIN1 svin influenza, amerikansk forskning viser.
Resultaterne tyder på graviditeten øger risikoen for komplikationer.
Det understreger behovet for at sikre, at gravide kvinder får hurtig anti-viral behandling, og er lavet en topprioritet, når en vaccine bliver tilgængelige.
Undersøgelsen, som den amerikanske Centers for Disease Control og Forebyggelse, vises i The Lancet Medical Journal.
Forskerne studerede 34 bekræftede eller sandsynlige tilfælde af svin influenza-infektion blandt gravide kvinder.
"Vi skal huske, at de fleste gravide kvinder, der fange sygdommen må forventes at gøre en ukompliceret nyttiggørelse"
Department of Health
De fandt 11 blev indlagt på hospital – en sats fire gange højere end i den almindelige befolkning.
Kvinderne er omfattet en bred vifte af aldre og racer, og de blev i forskellige stadier af graviditeten. Seks senere døde efter at have udviklet lungebetændelse.
Ingen af de kvinder, der døde havde fået antivirale lægemidler hurtigt, inden for de første 48 timer efter symptomerne indtræder.
Fem af disse kvinder undergik kejsersnit leverancer. Fire af de babyer har nu forladt hospitalet, og den femte, født meget tidligt, klarer sig godt. Ingen af de nyfødte viste tegn på svin influenza-infektion.
Historiske ekkoer
Forskerne har accepteret, at læger kan være mere tilbøjelige til at indrømme, gravide kvinder til hospitalet end andre patienter – men sagde det var usandsynligt, at være den eneste forklaring på de højere hospitalsindlæggelse sats.
Det kan være, at graviditeten svækker immunsystemet, hvilket gør komplikationer mere sandsynlige.
Skrivning i The Lancet, at forskere, ledet af Dr. Denise Jamieson, sagde: "På grundlag af vores undersøgelse, gravide kvinder synes at være en øget risiko for komplikationer fra pandemiske H1N1-virus-infektion, med en højere anslået hospital optagelse end i den almindelige befolkning.
"Selv om beslutningen om at indrømme en gravid kvinde er kompleks og kan indeholde overvejelser udover blot sværhedsgraden af sygdommen, at en stor del af influenza-relaterede dødsfald i USA har været hos gravide kvinder er om."
Et lignende mønster blev set i influenza pandemier i 1918 og 1957, når dødeligheden for gravide kvinder var højere end for ikke-gravide kvinder.
En talsmand for ministeriet for sundhed, sagde: "Denne undersøgelse er en påmindelse om, at gravide kvinder kan have forøget risiko fra svin influenza, men vi skal huske, at de fleste gravide kvinder, der fange sygdommen må forventes at gøre en ukompliceret opsving.
"Gravide bør gøre tidlig kontakt med deres praktiserende læge, hvis de har influenzalignende symptomer."
Talsmanden sagde antivirale lægemidler Relenza var til rådighed i en inhaleret form, som ikke ville nå fosteret, og derfor ikke udgør nogen risiko for det.
Gravide Sharon Pentleton, fra Saltcoats, Ayrshire, skulle flyves til Sverige for speciallægebehandling i sidste uge efter at have udviklet en sjælden komplikation følgende infektion med svin influenza.
Ms Pentleton, som er under hendes blod rundsendes gennem en maskine, der beskrives som "stabil, men kritisk".
Enfotonon jufufduy Taphhaisp
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