Risk factors for genitourinary Chlamydia trachomatis (Ct) infection were investigated using an STD elative risk factor questionnaire among 176 patients and theirregular sexual partners. Twenty-four independent variabl...Risk factors for genitourinary Chlamydia trachomatis (Ct) infection were investigated using an STD elative risk factor questionnaire among 176 patients and theirregular sexual partners. Twenty-four independent variableswere selected for analysis, nine of which were confirmed asfactors associated with C. trachomatis. Four of the nine factorswere significantly correlated to infection using a multifactorialunconditional logistic regression model which included: levelof education (odds ratios [ORs]: 2.144 for below junior middleschool), number of sexual partners (ORs: 4.503 for≥5),number of regular partner's sexual partner (ORs: 16.333 for≥5), STD history of regular partner (ORs: 18.417 for theirSTD history). These data demonstrate that regular partner'ssexual behaviors are also an important risk factor for Ctinfection among STD clinic clients.展开更多
An epidemic model with a class of nonlinear incidence rates and distributed delay is analyzed. The nonlinear incidence is used to describe the saturated or the psychological effect of certain serious epidemics on the ...An epidemic model with a class of nonlinear incidence rates and distributed delay is analyzed. The nonlinear incidence is used to describe the saturated or the psychological effect of certain serious epidemics on the community when the number of infectives is getting larger. The distributed delay is derived to describe the dynamics of infectious diseases with varying immunity. Lyapunov functionals are used to show that the diseasefree equilibrium state is globally asymptotically stable when the basic reproduction number is less than or equal to one. Moreover, it is shown that the disease is permanent if the basic reproduction number is greater than one. Furthermore, the sufficient conditions under which the endemic equilibrium is locally and globally asymptotically stable are obtained.展开更多
文摘Risk factors for genitourinary Chlamydia trachomatis (Ct) infection were investigated using an STD elative risk factor questionnaire among 176 patients and theirregular sexual partners. Twenty-four independent variableswere selected for analysis, nine of which were confirmed asfactors associated with C. trachomatis. Four of the nine factorswere significantly correlated to infection using a multifactorialunconditional logistic regression model which included: levelof education (odds ratios [ORs]: 2.144 for below junior middleschool), number of sexual partners (ORs: 4.503 for≥5),number of regular partner's sexual partner (ORs: 16.333 for≥5), STD history of regular partner (ORs: 18.417 for theirSTD history). These data demonstrate that regular partner'ssexual behaviors are also an important risk factor for Ctinfection among STD clinic clients.
文摘An epidemic model with a class of nonlinear incidence rates and distributed delay is analyzed. The nonlinear incidence is used to describe the saturated or the psychological effect of certain serious epidemics on the community when the number of infectives is getting larger. The distributed delay is derived to describe the dynamics of infectious diseases with varying immunity. Lyapunov functionals are used to show that the diseasefree equilibrium state is globally asymptotically stable when the basic reproduction number is less than or equal to one. Moreover, it is shown that the disease is permanent if the basic reproduction number is greater than one. Furthermore, the sufficient conditions under which the endemic equilibrium is locally and globally asymptotically stable are obtained.
