Dynamic analysis of class A and class B infectious diseases in Zhoushan islands, 1950-2007

Objective　The study was conducted to determin the epidemiological characteristics of class A and B infectious diseases in Zhoushan city, Zhejiang province, provide the evidence for the development of prevention and control measures. Methods　Descriptive epidemiological analysis was performed on the report data of class A and B infectious diseases from 1950-2007 in Zhoushan city. Results　The average annual morbidity, mortality and fatality rates of infectious diseases had declined from 2844.61/lakh, 53.55/lakh and 1.9% in the 1950s to 364.66/lakh, 0.14/lakh and 0.04% in 2007 respectively. 2000- 2007, the top five class A and B infectious diseases with the highest morbidity included: hepatitis (124.37/lakh), syphilis (78.76/lakh), gonorrhea (61.23/lakh), pulmonary tuberculosis (48.54/lakh) and dysentery (36.48/lakh). Conclusion　Significant changes on the spectrum of infectious diseases and the rank of major infectious diseases were observed in Zhoushan city, therefore corresponding prevention and control strategies should be revised according to these changes.