The annual attack of norovirus has struck Sweden, especially in the southern part of the country.
The outbreak of the vomiting disease is later than usual. It had been speculated that all the precautions against swine flu, including frequent washing of hands with disinfectant, had blocked what is a regular occurrence in Sweden every winter.
But now, as swine flu is disappearing from this country, the authorities report the return of norovirus. So far, they say the outbreak is at normal levels, with the exception of some hospitals in southern Sweden, where some wards have had to close and others impose restrictions on visits.