Public health experts are looking at how demographics affect the death rates in different regions. Some European countries with older populations have reported higher fatality rates, for instance.
An April report by the European Centre for Disease Prevention and Control looked at over 300,000 cases in 20 countries and found that about 46% of all fatalities were over the age of 80.
In Indonesia, hundreds of children are believed to have died, a development health officials have attributed to malnutrition, anemia and inadequate child health facilities.
Health experts caution that the official data likely does not tell the full story, with many believing that both cases and deaths have likely been underreported in some countries.