Effectiveness of 10-year vaccination (2001-2010) on Hepatitis A in Tianjin, China.

Vaccination is an effective strategy to prevent and control the transmission of hepatitis A. Hepatitis A immunization program has been taken into effect since 2001 in Tianjin, China. This study evaluated the effectiveness of strategies in the prevention and control of hepatitis A.

[Current status of hepatitis B immunization and strengthened immune memory among first-year middle school students in Tianjin].

Objective: To investigate the immunization status of hepatitis B vaccine who were inoculated at birth, HBV infections and the vaccine booster effect in the first-year middle school students (12 - 14 years old).

Methods: A cluster, stratified simplified random sampling method was administrated. The sample size was at least 218, which was calculated by Epi Info 3.

[Study on the report criteria and focus management mode of the virus hepatitis cases in Tianjin].

Objective: To establish the focus management mode and the report criteria more perfectly for the virus hepatitis cases, especially for the hepatitis B.

Methods: One district was set as the research area, in which there was enough cases resource and relatively separated from the other districts, then a first or second-class hospital was appointed to take the cases focus diagnosis, report and management.

Results: The focus hospitals had reported 97% (323/331) of cases in the research area between June,2007 and June,2008; moreover,the rate in establishing case-card was 97.

[A study on the influenza surveillance program in Tianjin, 2004].

Objective: To explore the trend of influenza epidemics, predominate strains of the virus in Tianjin city and to analyze the economic impact of vaccine-based interventions for the prevention and control of influenza.

Methods: Data on epidemiological studies and on virus surveillance was gathered. Monte Carlo mathematical simulation modelwas used for data analyses.

[Epidemiological characteristics of severe acute respiratory syndrome in Tianjin and the assessment of effectiveness on measures of control].

Objective: To analyze the epidemiologic characteristics of severe acute respiratory syndrome (SARS) and to evaluate the effectiveness on its major control measures in Tianjn.

Methods: Adopting two case reports 1 and 2, designed by the Tianjin Centers for Disease Control and Prevention to develop a unified case-tracing table including the map of the distribution of close contacts to SARS patients. With those methods, investigation on patients and their close contacts at hospital wards, families, communities and institutions of the patients were carried out.