Two new cases of swine flu were confirmed in Hong Kong yesterday, taking the total to 12. The mother of two young children, who were earlier found to have the virus after a tour of the United States, was confirmed to have the infection. And a four-year-old boy was found to be infected after visiting Canada. The mother and her husband, from Cavendish Heights in Jardine's Lookout, had shown no symptoms when their son and daughter were confirmed to have swine flu on Monday, but she fell sick the next day, said Thomas Chung Wai-hung of the Department of Health. She has been treated with Tamiflu and is under quarantine with her husband and children in Princess Margaret Hospital. The father still seemed to be in the clear while the children were in stable condition. Dr Chung said it was difficult to conclude the case was domestic because it was highly likely she had contracted the illness from the same source in the US, where they had travelled from May 7 to 23. They returned to Hong Kong on Sunday. The boy in the other confirmed case developed a fever in Seoul on Thursday after a flight from Vancouver, after a visit from May 12 to 20. He had no obvious symptoms on the flight. His symptoms subsided last Saturday and the family boarded Korean Air flight KE613 and landed in Hong Kong at about 3pm on Sunday. They took airport bus E33 to their home at Siu Lun Court in Tuen Mun. The boy developed a fever again yesterday and his mother asked a maid to take him to see a Chinese medicine doctor in the district. They took a green bus without masks. His father took him to Tuen Mun Hospital in the evening. His cousin, 17, developed symptoms and was taken to Queen Mary Hospital.