 In June 2012 , a model based study was published finding that the number of deaths related to the H1N1 influenza may have been fifteen times higher than the reported laboratory confirmed deaths . According to their findings , 80 % of the respiratory and cardiovascular deaths were in people younger than 65 years and 51 % occurred in southeast Asia and Africa . The researchers believe that a disproportionate number of pandemic deaths might have occurred in these regions and that their research suggests that efforts to prevent future influenza pandemics needs to effectively target these regions . 
