Hong Kong - A 7-year-old girl has become the third child to die of a mystery illness in Hong Kong, government officials said Friday.
The girl, who was admitted to hospital on August 8 with encephalitis or brain inflammation, died Friday.
Two other girls, aged 9 and 3, died last week with myocarditis, inflammation of the heart, and blood poisoning.
A fourth child, a 3-year-old boy, is also in a critical condition with sepsis and encephalopathy - blood poisoning and brain abnormalities.
Health officials are already conducting an investigation into the cause of the illnesses, however it is not yet known whether one single virus or different viruses are responsible.