WHO Basis for Risk Grouping: Each country classifies the agents in that country by risk group based on pathogenicity of the organism, modes of transmission and host range of the organism. These may be influenced by existing levels of immunity, density and movement of host population presence of appropriate vectors and standards of environmental hygiene.
Availability of effective preventive measures. Such measures may include: prophylaxis by vaccination or antisera; sanitary measures, e.g. food and water hygiene; the control of animal reservoirs or arthropod vectors; the movement of people or animals; and the importation of infected animals or animal products.
Availability of effective treatment. This includes passive immunization and post-exposure vaccination, antibiotics, and chemotherapeutic agents, taking into consideration the possibility of the emergence of resistant strains. It is important to take prevailing conditions in the geographical area in which the microorganisms are handled into account. Note: Individual governments may decide to prohibit the handling or importation of certain pathogens except for diagnostic purposes.
Heterosexual women are another group at increased risk for STDs and HIV infection. Only 20% to 25% of sexually active American women have male partners who use condoms, and even in these cases, such use is sporadic. Socioeconomic status impacts condom use; poor women are less likely to have male partners who use condoms.
References: Maurer, F. A., & Smith, C. M. (2009). Community/Public Health Nursing Practice Health for families and populations(4th ed.). (n.d.). In Risk Grroup classification for Infectious Agents. Retrieved October 29, 2014, from http://www,absa.org/riskgroups/