A 25-year-old woman has become the fourth Dutch national diagnosed with swine flu, news agency ANP reports.
The woman had not been in Mexico, but returned to the Netherlands via London after a short stay in New York on May 30.
The British authorities have been alerted and are tracking down everyone on board the flight, ANP says.
Three earlier Dutch victims of swine flu have all recovered well. They all contracted the virus in Mexico.
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