"Unlike previous 'seasonal' influenza strains, which impact heavily on elderly people and people with severe coexisting medical conditions, the H1N1 virus affected a different profile. Critical illness due to swine flu was most common in infants and middle aged people; with pregnant patients, the overweight, and indigenous patients particularly affected. Overall, about one-third of patients admitted to an ICU because of swine flu had no underlying health problems. " Associate Professor Webb said.

Professor Rinaldo Bellomo, Foundation Chair of the ANZICS CTG and Director of Intensive Care Research at Austin Health, Melbourne said the results of the study would be shared with health authorities in other countries to assist them better prepare for their flu season.

"We have come through our flu season and our assessment of the impact of the H1N1 strain will assist them prepare for any outbreak. The H1N1 virus has taken hold in many countries already, but many countries in the Northern Hemisphere will benefit from the lessons we have learned," Professor Rinaldo Bellomo said.

"Fortunately a vaccine is now available to prevent the complications of swine flu and it is important that all members of the community and especially those with risk factors, consider being vaccinated," he said.

Source: Monash University