India would have never thought that bird flu would have cost so many lives in 2009-10, the first time when the flu attacked countries across the globe.

A research being taken out by Centers for Disease Control and Prevention (CDC), US, and the All India Institute of Medical Sciences, (AIIMS), India, have concluded in their study that there were 15 times more deaths than being registered in the World Health Organization.

Study researchers revealed that total number of deaths being registered from bird flu in the WHO were somewhere about 18,500. However, according to their research, total number of people, who must have lost their life due to the flu, must be between 1.51 lakh and 5.75 lakh.

In addition, it has been further revealed that majority of people, who had lost their lives due to the flu were younger than 65 years. "As a general rule, the number of lab-confirmed flu deaths is known to be significantly lower than the number of flu deaths that actually occur", said study researchers.

In order to give such shocking news, the study researchers have conducted an extensive study for complete one year. During this period, they have assessed 17 sites across 13 countries.