The Acquired Immune Deficiency Syndrome Essay

2090 Words 9 Pages
INTRODUCTION

HIV/AIDS
The Acquired immune deficiency syndrome (AIDS) was first identified as a distinct new disease in 1981. In 1983 HIV was identified at the causative agent for AIDS. The mean time from HIV infection to AIDS is approximately 10 years. There is no effective medicine to cure it and the infected individuals do not recover: that is, they continue to be infectious throughout their lives. HIV infection is a complex mix of diverse epidemics within and between countries and regions of the world, and is undoubtedly the defining public health crisis of our time. The AIDS is a disease of the human immune system caused by the human immunodeficiency virus (HIV). It becomes an important infectiousdisease in both the developed and
…show more content…
Without drug treatment, HIV infection nearly uniformly fatal within 5–10 years and the average survival time after developing AIDS is just 9.2months, while with drug therapies treated individuals can live longer free of HIV related symptoms [48,50]. The goals of drug therapies are to prevent damage to the immune system by the HIV virus and to halt or delay the development of the infection. In fact, worldwide it is estimated that between 250,000 and 350,000 deaths were averted in 2005 as a result of increased treatment access (WHO/UNAIDS 2005). There is currently no cure for HIV/AIDS. The only known methods of prevention are based on avoiding contact with the virus.

CLASSIC AIDS MODELS

The classical Anderson’s model (Murray, 1990) is a macroscopic model for AIDS. It is given by: dx/dt= -λ(t)xx(0) = 1

dy/dt= λ(t)x = λ(t)(1 - y) y(0) =0 (1)

Whereλ(t) is the transference rate between infected individuals and infected individuals that develop AIDS, x is the proportion of infected

Related Documents