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To evaluate the effect of Supplementary Immunization Activities (SIAs) among the migrant preschool children in Chaoyang district of Beijing since 2005 to 2007, and to provide reference for formulating the strategies for Expanded Program on Immunization (EPI).The descriptive epidemiology was used to analyze the data of SIAs among the migrant preschool children in Chaoyang district since 2005 to 2007.The SIAs data demonstrated an increasing number of the floating preschool children in Chaoyang district from 2005 to 2007, and the increase rate of year-on-year in 2006 to 2007 was 12.67% and 4.60% respectively. The registration rates of immunization card and identification among the floating preschool children increased by years from 2005 to 2007. The zero-dose rates of Oral Polio Vaccine (OPV), Measles Vaccine (MV), Diphtheria-Pertus-sis-Tetaus vaccine (DPT), Meningococcal Polysaccharide Vaccine (MPV) and Japanese Encephalitis Vaccine (JEV) showed a decrease trends since 2005 to 2007. The age special incidence rate and proportion of vaccine-preventable diseases for the people who were 1- 4-years-old decreased.It is an effective management pattern that the government plays a dominated role in Supplementary Immunization Activities (SIAs).

To analyse and find out the influence of varicella vaccine inoculation to varicella morbidity.The case-control study was conducted. During October 1st 2006 to July 31st 2007, 193 varicella cases were identified, and 342 control subjects were matched.1. The proportion of nonvaccinated in case group was higher than that of control group (odds ratio 1.49, 95% confidence interval 0.99-2.24, P=0.043). 2. The morbidity to the people who received one dose varicella vaccine was obviously higher than that of people who reiceived more than 2 dose (odds ratio 3.04, 95% confidence interval 1.25-7.72, P=0.007). 3. Significant differences were not observed between the domestic vaccine and the impoted vaccine (odds ratio 1.38, 95% confidence interval 0.53-3.71 P=0.483). 4. Clinical symptom of the vaccine was lighter than that of the unvaccinated, and rash was not typical.1. Inoculation varicella vaccine was effective measures to prevent varicella. 2. The risk to get varicella of one-dose vaccinated was higher than that of more than 2-dose vaccinated. 3. The effectiveness of domestic varicella vaccine was as high as impoted vaccine. 4. The clinical symptom of varicella would be alleviated if the person had vaccinated.