In Egypt the fourth person has died after being infected with bird flu. There have so far been 12 reported cases of human bird flu in Egypt. Around the world, more than 100 people have died from the H5N1 strain of the disease since 2003 - the majority of them in Asia.
The victim, an 18-year-old woman from north of Cairo, was admitted to hospital on Monday and found to be suffering from the H5N1 virus.
Nasser Kamel, a spokesman for the Supreme National Committee to Combat Bird Flu, said: "It was an 18-year-old woman from the Menufiya governorate. She was already in bad health when she arrived to hospital."
The woman, named as Iman Abdel Gawad, was believed to have been handling infected poultry. Many women in Egypt are responsible for slaughtering domestic birds.
Of the 12 people infected in the country, four have died, five have recovered and three are still receiving treatment, health officials say. The World Health Organization has expressed concern about the number of deaths in Egypt in a relatively short amount of time.
experts fear the virus could mutate into a form that passes easily between humans, possibly sparking a pandemic.
However, there is no evidence that this has happened yet.