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. 2010 Dec 29:26–455. doi: 10.1016/B978-0-443-07151-5.50005-6

Table 3.88.

Classes I–V for microorganisms based on the risk of occupational transmission

Class Vaccine available Occupational risk above that in community Prevalence in the community Other characteristics Microorganisms
I Yes Virtually none Low

  • Rubella virus

  • Measles virus

  • Clostridium tetani

  • Corynebacterium diphtheriae

  • Poliovirus

  • Influenza virus

II No Low Low

  • Neisseria gonorrhoeae

  • Treponema pallidum

  • Staphylococcus spp

  • Streptococcus spp

  • Candida spp
III No Yes High

  • Herpes simplex

  • Varicella zoster

  • Cytomegalovirus

  • Epstein–Barr

  • Herpes 6

  • Herpes 7

  • Herpes 8

IV No (except HBV) Yes Low High morbidity/mortality

  • HBV

  • HCV

  • HIV

V No Yes Low Resistant strains; air transmission Mycobacterium tuberculosis