The Centre for Health Protection has detected two more human swine flu virus strains with mutations similar to the one Norway reported last year.

The new cases involve two women, aged 53 and 59. The former came down with flu symptoms on December 2 and is in North District Hospital in stable condition. The other fell ill December 12 and died on December 19 in Kwong Wah Hospital.

Meanwhile, the specimen of a case announced on November 23 involving a 13-month-old child has tested negative for the mutation. The child has recovered.

Hong Kong has had nine mutation cases so far.