| Infectious disease is a kind of disease caused by infectious pathogens or their poisonous product. Pathogens are passed on directly or indirectly to those easily infected people through the infected people, animals or the hosts.The occurrence, development and spread of infectious disease are ascribed to the interrelation, interaction and inter-struggle between pathogens and the hosts or the external environment. The process of the spread of infectious disease among people goes like this: Being excreted from the infected people, pathogens invade the easily infected people to form new kinds of infections and then occur and develop continually. Not only a biological phenomenon, but the infectious disease epidemic is a social phenomenon. The epidemic only occurs and develops under the influence of certain social and natural factors. However, these two factors also have the influence on the control, prevention and extermination of infectious disease. The social and natural factors influence infectious disease by acting on the infectious sources, ways and the easily infected people. The resurgence of parts of infectious disease to invade human beings from 1970s results from the joint action made by a lot of social and natural factors.To study influential factors of infectious diseases, we investigates the permanent residents and floating population in Gongshu District of Hangzhou City, and then provide scientific strategies for prevention and control of infectious disease aiming at the two different population .Material and MethodsThe data-collection for the study comprised four town of Gongshu District,Hangzhou, Zhejiang Province. The study population included the whole diagnosed patients with infectious disease, containing 47 permanent residents and 49 floating population. It is one to five individual-matched to the expected towns of cases by age (six-year groups), gender and population (the permanent residents or the floating population).A constructed questionnaire elicited information on family overall conditions, personal basic conditions, the state of infectious disease and the prevention and protection of infectious disease and so on. Each subject was interviewed face-to-face by trained interviewers. Each subject was interviewed face-to-face by trained interviewers.The data were processed with software of Epi Data3.0; SPSS 11.5 in personal computer after verified .The satisfied methods was conditional Logistic regression models.Results1 Prevalence surveyMen accounted for 49.7 percent of the 1480 permanent residents in this survey and women accounted for 53.3 percent. The average age of them was 38.86. While of the floating population, men accounted for 53.6 percent and women 46.4. Their average age was 28.07. There were 47 patients in the permanent residents (the prevalence rate is 317/100,000) and 49 ones in the floating population (the prevalence rate is 381/100,000). There was no significant difference between the two prevalence rates (x2=0.834, P>0.05). However, there was a significant difference in the different types of easily-caught infections. The first five easily-caught infections among the permanent residents were mumps, viral hepatitis A, bacillary dysentery, influenza, viral hepatitis B and measles. While among the floating population, they were viral hepatitis B, influenza, measles, viral hepatitis A and bacillary dysentery.2 Case-control studyThe basic conditions of the two types of population showed no significant difference to the occurrence of infections. The living environment of the permanent residents showed no significance, too. But the bad lighting in the dwellings of the floatingpopulation and the public conveniences were related factors. Their relative risks were estimated to be 2.40 and 2.37 respectively. To the permanent residents, their living style such as raising pets and having a close contact with in patients were related factors and the relative risks were about 2.77 and 19.04. As to the floating population, there were five factors rel...
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