I. General Situation of the Epidemics
In the 16th week of 2009 (from April 20 to April 26), 2,820 cases of 15 kinds of legally defined infectious diseases and 3 dead cases (hepatitis B) were reported in 18 districts and counties in the whole city. Among them, there are 1080 cases of 9 types of class B infectious diseases, up 3.55％ from last week and down 6.33％ from the same period of last year. The top five categories of diseases with the highest incident rates are: diarrhea, tuberculosis, hepatitis B, measles and syphilis; 1,740 cases of 6 kinds of class C infectious diseases were reported, down 3.12％ from the last week and up 49.48％ from the same period of last year.

Among them, the diseases of class C report case increase are hand-foot-mouth disease, mumps and influenza; the decline diseases are rubella, acute hemorrhagic conjunctivitis and other infectious diarrheal diseases.

II. Analysis of the Major Epidemics

(1) Measles
This week 95 cases were reported in the city, up 2.15% from last week and down 3.06% from the same period of last year. Among them, the top three districts and counties with the most reported cases are: Chaoyang, Fengtai and Daxing, accounting for 55.79% of the total number. Those infected are mainly scattered-living children, housekeeping staffs, unemployed people, cadres, students and business service staff. They take up 78.95% of the reported patients.

(2) Chicken Pox
This week 475 cases were reported, down 15.63% from last week and up 33.43% from the same period of last year. The top five districts and counties with the most reported cases are: Chaoyang, Fengtai, Haidian, Changping and Daxing, accounting for 62.95% of the total number. Those infected are mainly students and preschool children. They take up 78.53% of the reported patients.

(3) Hand-foot-mouth Disease
This week 878 cases were reported, up 7.47% from last week. The top five districts and counties with the most reported cases are: Fengtai, Chaoyang, Daxing, Changping and Haidian, accounting for 65.83% of the total number. Those infected are mainly scattered-living children and kindergarten kids. They take up 94.31% of the reported patients.

III. Key Notes
This week, the number of reported cases of intestinal canal infectious diseases continued to increase, and it started to exceed that of respiratory diseases. With the "5?1" holiday approaching, the activities of people traveling, holding party and dining together increased, which will further increase the possibility of intestinal canal infectious diseases and food poisoning incidents. This week, bacillary dysentery took place in a school of Shunyi District, with 14 reported cases. And therefore, the City Health Bureau requested the health departments to intensify supervision of food hygiene and environmental hygiene, and prevent local outbreaks of intestinal canal infectious diseases and food poisoning incidents.

In addition, as the people flocking into Beijing for tourism will increase, city health bureau also requested that disease control organizations and medical institutions at all levels should intensify the supervision of contagious respiratory diseases like measles, epidemic encephalitis, influenza, mumps and chicken pox, for preventing its prevalence.