Costa Rica confirmed the country's fifth death case caused by the A/H1N1 flu on Sunday.

The dead, a 25-year-old woman, was 22-week pregnant with a pair of twins, Costa Rican Deputy Health Minister Ana Morice told local media.

She miscarried a few hours before she died Saturday at a hospital in the capital, Morice said.

Costa Rica has confirmed 351 cases of flu infections so far, and the government was worried about the rising trend of spreading, said Morice, noting that the authorities would strengthen preventive measures consequently.

Costa Rica reported its first A/H1N1 flu death on May 9.

(Xinhua News Agency July 13, 2009)