Spain and Uruguay on Tuesday reported their first deaths from swine flu, as Canada expressed fears that young people were particularly vulnerable to the virus.
In Spain, a 20-year-Moroccan woman died at a Madrid hospital on Tuesday, becoming the country's first fatality from the A(H1N1) infection.
The woman, who was seven months pregnant and suffered from asthma, died at dawn of a respiratory illness provoked by the infection, said a health ministry statement.
She had been receiving treatment for several days, but her condition deteriorated on Monday, prompting doctors to carry out a Caesarean delivery of the baby, who was fragile but unaffected by the virus, the ministry said.
Three other patients were be in a serious condition in Spanish hospitals, health officials said.
Her death was the fourth from swine flu in Europe.
Late on Monday, Britain reported its third swine flu death -- a schoolgirl whom officials said had underlying health problems.
In the Uruguayan capital Montevideo health ministry officials reported the country's first victim, a 60-year-old woman.
"Late today a woman died in Montevideo with multiple organ failure and tests confirmed the presence of the A(H1N1) virus," the ministry said in a statement.
Uruguay has 195 confirmed cases of swine flu, including 12 requiring hospitalization, according to the ministry.
Health authorities in Canada meanwhile expressed alarm that young people were being hit hardest by the infection.
Preliminary data showed the virus had mostly infected people under the age of 20 in Canada, and relatively few people over 65.