Two new cases of children infected by the intestinal virus EV71 have triggered an alarm about more possible cross-border infections. The Centre for Health Protection said a one-year-old girl who lived in Fujian province developed fever and rash on her hands and feet on April 27 after her arrival in the city on April 25. She was admitted to Queen Elizabeth Hospital on May 1 and discharged on Monday. Tests confirmed EV71 infection. A two-year-old boy who travelled to the province between April 23 and 27 developed fever, cough and runny nose on April 28 and lesions on his mouth two days later. He was admitted to Tsuen Wan Adventist Hospital on May 1 and discharged yesterday. Tests confirmed the viral infection. The new cases came to light a day after Secretary for Food and Health York Chow Yat-ngok warned that the number of infections could rise. His warning followed reports of one more death from the virus in Zhejiang province, taking the mainland death toll to 26 since early March amid 9,251 infections. Medical sector lawmaker Kwok Ka-ki, said the latest cases, which took the number this year to 12, had rung an alarm bell about more cross-border infections in the school holidays this month when many children would go to the mainland. He said they should observe strict hygiene. The virus, known as enterovirus 71 or EV71, can cause hand, foot and mouth disease. It is highly contagious and spreads through direct contact with the mucus, saliva or faeces of an infected person.