To learn the epidemic law of virus hepatitis in Dongli District since 1990 to 2004 and provide scientific basis for the work of prevention.
目的了解和掌握天津市东丽区1990 ~ 2004年病毒性肝炎的流行规律，为制定防治对策提供科学依据。
Like dysentery, typhus, diphtheria, the epidemic brain keel turns the membrane inflammation and hepatitis B and so on, may have the recovery period cause of disease carrier.
如痢疾、伤寒、白喉、流行性脑脊翻膜炎和乙型肝炎等，都可以有恢复期病原携带者。
Objective to learn the epidemic status of viral hepatitis in China to facilitate the development of control strategies.
目的了解我国病毒性肝炎流行现状，为制定控制策略提供依据。
Objective to identify the cause and transmission route of hepatitis a, to analyse the epidemic fac - tors and to evaluate the control effect.
目的查明甲肝暴发原因和传播途径，分析流行因素，评价控制效果。
Aiming at the spread mechanism of a class of epidemic diseases similar to hepatitis b, an ordinary differential dynamical model is established.
针对类似乙肝的一类流行病的传播机制，建立较好的常微分动力模型。
Aims: in order to clarify the clinical epidemic of hepatitis G virus (HGV) and evaluate the virulence of HGV.
目的：为了弄清肝病患者中庚型肝炎病毒(HGV)的临床感染情况和评估庚型肝炎病毒的致病力。
OBJECTIVE To explore the hepatitis B vaccine strategies on incidence and prevalence of hepatitis B, to further explore prevention and treatment strategies to control hepatitis B epidemic situation.
目的为了探索乙肝疫苗免疫策略对乙型肝炎发病和流行的影响，进一步探索防治策略，控制乙肝的流行态势。
Objective to study the epidemic characteristics and prevalent trend of viral hepatitis in Hainan province in recent 10 years, and to provide theoretical basis for the control of the disease.
目的研究海南省近10年来病毒性肝炎的发病趋势及流行规律，为制定防治策略提供理论依据。
Objective to know the relevant factors and epidemiological characteristics of hepatitis a epidemic in school and to put forward the preventive intervention measures.
目的了解甲型病毒性肝炎在学校流行的相关因素和流行病学特点，提出防控干预措施。
Objective to know the relevant factors and epidemiological characteristics of hepatitis a epidemic in school and to put forward the preventive intervention measures.
目的了解甲型病毒性肝炎在学校流行的相关因素和流行病学特点，提出防控干预措施。
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