Citizen Ms. Zhang told reporters that at about 14:35 on June 10, she led her 1-year-old son to receive inactivated polio vaccine. After about 30 minutes of observation, she led her son home. At about 16:30 that day, his son cried. I contacted [the vaccination station] and said it was normal.
Ms. Zhang recalled that her son had symptoms such as purple lips and bloated stomach when he was crying. Then she took her child to Gaobeidian Hospital. At about 7:30 on June 12, the child cried again. She took her son to see a doctor again. An hour later, the rescue failed and she was declared dead.