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€¢ Tell her that almost anyone who has touched or kissed the child could have passed on the virus to her. Also, that it is virtually impossible to avoid being infected, as about 80% of people carry the virus.
€¢ As cold and wind seemed to be a trigger for her daughter's only attack, she should take precautions to protect the child's face and mouth in such conditions. She should also not let her daughter's skin dry out in cold weather, as infection can begin in cracked skin.
€¢ To prevent her son getting an infection from his sister, she should make sure that he does not share her cup or cutlery when she has active cold sores, but it is not necessary at other times: although the virus is still present, it is inactive.