The researchers have revealed the mystery behind swine flu which killed many sufferers in their prime of life. Usually, the people who are very old and who are very young are most susceptible to swine flu. However, researchers think that the elderly people were protected as they had come across an analogous virus in their youth.
Their immune system had responded effectively in youth periods. Therefore people who were in their twenties to fifties were very young to have met that helpful virus. Despite their memory of the body other flu viruses activated antibodies which reacted hazardously with the swine flu, escorting to lung damage.
In middle-aged inhabitants, they saw a lot of people getting very, very ill, according to Dr Fernando Polack from Vanderbilt University, Tennessee. It was also found that many adult sufferers of latest swine flu epidemic had lugs full of a protein known as C4d.
This normally helps to damage viruses but researchers think that when it met the 2009 virus, despite it helped in killing the host. The young infants escaped the worst as they were very young to have crosswise many flues in the past.
Therefore their immune systems were less prone to backfire on them, reported the study published in the journal Nature Medicine reports.