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The H1N1 pandemic virus can infect cells deeper in the lungs than those affected by seasonal flu viruses, say researchers who looked at how the virus seems to operate.
Most people infected with swine flu have relatively mild symptoms. Doctors have also reported that some patients hospitalized with swine flu develop worse symptoms than seasonal flu victims.
"If the flu virus mutates in the future, it may attach to the receptors deep inside the lungs more strongly, and this could mean that more people would experience serious symptoms," Feizi said in a release.
"We think scientists should be on the lookout for these kinds of changes in the virus so we can try to find ways of minimizing the impact of such changes."
Most people infected with swine flu have relatively mild symptoms. Doctors have also reported that some patients hospitalized with swine flu develop worse symptoms than seasonal flu victims.