'The medical staff could not determine the source of her infection, whether it originated inside or outside Bahrain, as she arrived to the hospital in a critical condition and it was not possible to ask her about the source of her infection,' al-Awadhi said.

He said she also had other diseases that hindered her response to treatment and contributed to her eventual death.

The Gulf island, which was the first of the six Gulf states to report a swine flu infection in late April, has dealt with more than 200 cases. The majority of cases were mild and the patients have recovered.