The National Veterinary Institute says a duck found inside the southern city of Karlskrona last week has the H5 bird flu subtype. Three other ducks from the outskirts of Oxelösund, on the coast around 90 kilometers south of Stockholm, have also been found carrying bird flu.
In both cases, more tests are needed to determine if it is the deadly H5N1 strain. Protective zones have been set up around both areas.
Six other wild ducks found in Sweden have tested positively for the H5 subtype; they were all found around the warm waters near the nuclear power station in Oskarshamn. Two have been sent to a laboratory in Britain for further testing.