(photo: there are many sequelae of covid-19. Children infected with covid-19 suffer from temporary blindness once or twice a day. Parents can't ignore it.) In the past two weeks, the number of children infected with COVID-19 has increased sharply, and the number of children under three years old who have been recruited has increased by nearly 30%. In addition to being more prone to severe cases, children infected with the epidemic will also cause a variety of "covid-19" sequelae. Recently, a sick child was suspected to have been attacked by the virus and suffered from temporary blindness. In addition, nearly 60 children who have recovered from the disease have developed "children's multisystem inflammatory syndrome", which is double the number three months ago. Experts said that even after receiving adequate treatment, the chance of 100% recovery is still low. They called on parents to take their children to vaccinate against covid-19 as soon as possible and to protect them before the winter epidemic rebounds. The number of confirmed cases of COVID-19 in children has continued to increase. In the past two weeks, more than 4600 children under the age of 9 were infected, of which 1130 were children under the age of 3. Many of the recruited children have various "long-term new coronavirus" symptoms after recovery, including mid-term and long-term sequelae. Guan Rihua, a consultant doctor of the Department of child infectious diseases of Princess Margaret Hospital, said yesterday that one infected child (over 8 years old) referred by an ophthalmologist was temporarily blind once or twice a day and lasted for 10 to 30 seconds each time. The reason was unknown. He pointed out that this symptom was rare and was the first case in Princess Margaret Hospital. He was conducting an assessment with a brain doctor, conducting magnetic resonance imaging for the sick child, examining his cognitive function, and so on. He also asked an ophthalmologist to understand the situation. Guan Rihua said that he had tracked the recovery of 288 children aged 3 to 11 after 12 weeks of infection. As of yesterday, 20% of the children had at least one "covid-19" disease. Looking up the information, he said in May that about 10% of the more than 130 follow-up cases of recovered children with covid-19 were suspected to have "long covid-19" symptoms. "Multi system inflammatory syndrome in children" (mis-c) is a mid-term sequelae. As of mid May, more than 30 children in Hong Kong had developed mis-c, which increased to nearly 60 yesterday. Guan Rihua pointed out that more than half of the sick children needed intensive treatment. A 10-year-old boy developed mis-c about 4 weeks after recovering from covid-19. He presented with swelling of right neck lymph nodes, persistent high fever, redness, rash, strawberry tongue and other symptoms. He appealed to parents and family doctors to refer their children to ha specialists for treatment as soon as possible if they developed persistent fever, chills, convulsions, vomiting, dyspnea and Kawasaki like symptoms after recovery. The Kai Tak children's hospital will also open an outpatient service this year. It will follow up children's mis-c cases on an annual basis. Ou Jiarong, chief physician of the infectious diseases division of the centre for health protection, said that the number of confirmed cases of young children had risen sharply recently. In the first two weeks of this month, 1130 cases of children under the age of 3 years and 3483 cases of children aged 3 to 9 years were confirmed, an increase of 29.29% and 6.74% respectively over the two weeks at the end of last month. The number of hospitalizations of infants and children under the age of 3 has increased. According to Liu Jiaxian, general administrative manager of the hospital authority, the number of hospitalizations of infants and children under the age of 3 has also increased. Yesterday, 22 people were hospitalized, and the number of serious and critical cases has also increased correspondingly. At least 6 months old