title: Host genes and infectious diseases. HIV, other pathogens, and a public health perspective.
abstract: BACKGROUND
  The global impact of infectious diseases is tremendous. In 1996, the 17 million deaths from infectious diseases accounted for one third of all deaths worldwide, while the acute and chronic morbidity from infectious diseases adds an additional great burden on global health. Multiple factors, host and nonhost, influence the susceptibility of individuals and populations to infectious diseases, as well as the severity of the illness once infected.
  
  
  METHODS
  We review the influence of host genes on the susceptibility to and severity of viral, bacterial, parasitic and fungal infectious diseases, on vaccine responsiveness and on treatments for infections. HIV/AIDS is discussed in detail because it is an example of an infectious disease influenced by multiple host genes and because of its impact. Although the HIV/AIDS pandemic dates only since the late 1970s, it has claimed the lives of 11 million people worldwide and, today, more than 30 million people are estimated to be HIV infected.
  
  
  CONCLUSIONS
  Our greater understanding of the genetic factors that influence morbidity and mortality of infectious disease leads to new avenues of prevention and treatment that can improve the health of individuals and populations.
authors.affiliation: Division of AIDS, STD and TB Laboratory Research, CDC, Atlanta, GA, USA.
authors.forename: J M
authors.initials: JM
authors.lastname: McNicholl
authors.forename: K T
authors.initials: KT
authors.lastname: Cuenco
mesh_terms: D003140:Communicable Disease Control; D003141:Communicable Diseases / Q000453:epidemiology / Q000235:genetics* / Q000382:microbiology; D019353:Endemic Diseases / Q000517:prevention & control / Q000706:statistics & numerical data*; D020022:Genetic Predisposition to Disease / Q000235:genetics*; D014943:Global Health; D015658:HIV Infections / Q000453:epidemiology / Q000235:genetics* / Q000517:prevention & control / Q000821:virology; D006801:Humans; D009026:Mortality / Q000639:trends; D011110:Polymorphism, Genetic / Q000235:genetics; D011634:Public Health; D012307:Risk Factors; D012720:Severity of Illness Index