I. General Situation of the Epidemics
In the 17th week of 2009 (from 0 a.m. on April 27 to 24 p.m. on May 3), 2,808 cases of 13 kinds of legally defined infectious diseases and 5 dead cases (namely 3 cases of hepatitis B and respective 1 case of hepatitis E and hepatitis not classified) were reported in 18 districts and counties in the whole city. Among them, 8 categories of Type B Infectious Diseases amounting to 941 cases were reported, 12.87% lower than last week and 16.80% lower than the same week last year. The top 5 categories of diseases with the highest incidence rates were as follows: dysentery, tuberculosis, hepatitis B, syphilis and gonorrhea. 5 categories of Type C Infectious Diseases amounting to 1867 cases were reported, 7.30% lower than last week and 12.00% lower than the same week last year.

II. Analysis of the Major Epidemics

(1) Measles
A total of 76 cases were reported this week, 20.00% lower than last week and 8.43% lower than the same week last year. Among them, the top three districts and counties with the most reported cases are: Chaoyang, Fengtai and Daxing, accounting for 56.58% of the total number. Those infected are mainly scattered-living children, housekeeping staffs, unemployed people and students. They take up 57.89% of the reported patients.

(2) Chicken Pox
A total of 468 cases were reported this week, down by 1.47% than last week and up by 8.08% than the same period of last year respectively. The top 5 regions reporting the most incidence rates were Haidian District, Chaoyang District, Fengtai District, Changping District and Daxing District, accounting for 68.80% of the total reported cases. Those infected were mainly students and preschool children, accounting for 81.62% of the total.

(3) Hand-foot-mouth Disease
This week, a total of 921 cases were reported, up by 4.90% than last week. The top 5 districts and counties with the most cases are Fengtai, Daxing, Haidian, Chaoyang and Changping districts, accounting for the 67.32% of the total reported cases. The reported cases are mainly composed of preschool children, residentially-scattered children and students, accounting for the 95.33% of the total.

III. Key Notes
In accordance with the request of notice (2009 No. 8) of the Ministry of Health, the Ministry of Health has incorporated A/H1N1 (formerly known as Human Swine Influenza) into Type B infectious diseases according to the regulations of the "Communicable Disease Prevention Act of People's Republic of China", and taken the prevention and control measures of Type A infectious diseases. To this end, health prevention institutions at all levels should do a good job in prevention and control of A/H1N1 in accordance with the requests of such law and regulation as "Communicable Disease Prevention Act of People's Republic of China" and "Management Criterion of Infectious Diseases Information Reporting".

This week, the epidemic situation of infectious diseases remained stable, with a slight decrease of Type B and slight increase of Type C from last week. The case number of hand-foot-mouth disease increased slightly. May — July is the peak season of hand-foot-mouth disease, so the city health bureau requested that health and epidemic prevention departments at county and district levels continue to strengthen cooperation with education relevant departments, closely monitor the hand-foot-mouth disease epidemic, strictly implement various prevention and control measures of hand-foot-mouth disease, and achieve the goal of "early detection, early reporting, early treatment, early quarantine" to prevent the outbreak and spread of the epidemic.