A fourth case of swine flu has been confirmed in Switzerland, the Federal Health Office said on Wednesday.
The office said the man concerned was diagnosed with the disease after returning to Switzerland from the United States. He lives in the northwestern canton of Basel Country, but no other details about him were released.
The airline on which the man travelled provided the health office with a list of passengers. Following the recommendations of the Geneva-based World Health Organization, only those travellers sitting in the two rows closest to the patient have been informed.
There are currently more than 13,000 cases of the H1N1 flu worldwide, including 95 deaths, according to WHO.
The Federal Health Office said the rise in the number of cases and regions affected increases the risk of more people coming down with the disease in Switzerland. It said another four cases are still under investigation.
swissinfo.ch with agencies
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