Measles is an acute respiratory infection caused by the measles virus that is highly contagious and spreads more easily in crowded, airless places. The measles patient is the only source of infection. Measles virus is present in the patient’s mouth, nose, pharynx, trachea, bronchial secretions and conjunctival secretions and is spread by airborne droplets (coughing, sneezing, talking). Patients are infectious from 2 days before the onset of the disease until 5 days after the appearance of the rash, and the isolation period needs to be extended to 14 days after the appearance of the rash if the patient has comorbidities such as pneumonia. People who have not been vaccinated are generally susceptible to measles. The incubation period after infection with measles virus is long, averaging 14 days, with a minimum of 7 days and a maximum of 21 days. The main symptoms include fever, red rash with cough, catarrhal rhinitis or conjunctivitis, and in some cases, serious complications such as pneumonia. Therefore, if you have measles, you should go to an infectious disease hospital for diagnosis and treatment as soon as possible. Because of the high rate of childhood measles vaccination in Beijing, the incidence of measles in Beijing in recent years has been concentrated in adults over 20 years of age and in young infants who are under the age of vaccination. Beijing has always taken relatively strict measures for measles prevention and control. When measles cases are detected, CDC personnel will conduct an epidemiological investigation of each case, collect samples for testing, and conduct emergency vaccinations for close contacts of the case. Emergency vaccination can be effective in controlling the spread of measles. Disinfection efforts are also carried out to eliminate the virus or ventilate the virus outside as soon as possible by disinfecting the indoor environment, wet sweeping, and opening windows. Because of the recent rise in measles cases, the CDC recommends that: 1. People should pay attention to personal hygiene and keep indoor air circulation; if they need to go to the hospital because of illness, they should do a good job of self-protection and pay attention to wearing a mask to reduce cross-infection. 2, parents with small children at home, as far as possible to take their children to the concentration of people in public places. Take your child to get the measles-rubella diphtheria vaccine when they are 8 months old, the measles-rubella-mumps diphtheria vaccine when they are 1.5 years old, and another measles-rubella-mumps diphtheria vaccine when they are 6 years old. 3. If you get measles, you should actively cooperate with the disease control department to implement various preventive and control measures. For those at high risk for emergency measles vaccination as determined by health epidemiologists, you should receive measles vaccination as soon as possible. Measles patients must be isolated at home to avoid contact with other people. 4. Due to the long incubation period of measles, collective units with measles cases should observe any new suspected cases within 21 days after the last case of the patient and report new cases as soon as they appear. Collective units with an outbreak during the observation period should cancel group activities or meetings to reduce the risk of virus transmission.