What Microorganisms are Deactivated
by Germicidal Ultraviolet Light?

Bacteria UV Light Dose
Agrobacterium lumefaciens  5 8,500
Bacillus anthracis  1,4,5,7,9 (anthrax veg.) 8,700
Bacillus anthracis  Spores (anthrax spores)* 46,200
Bacillus megatherium  Sp. (veg) 4,5,9 2,500
Bacillus megatherium  Sp. (spores) 4,9 5,200
Bacillus paratyphosus  4,9 6,100
Bacillus subtilis  3,4,5,6,9 11,000
Bacillus subtilis  Spores 2,3,4,6,9 22,000
Clostridium tetani 23,100
Clostridium botulinum 11,200
Corynebacterium diphtheriae  1,4,5,7,8,9 6,500
Dysentery bacilli  3,4,7,9 4,200
Eberthella typhosa  1,4,9 4,100
Escherichia coli  1,2,3,4,9 6,600
Legionella bozemanii  5 3,500
Legionella dumoffill  5 5,500
Legionella gormanil  5 4,900
Legionella micdadei  5 3,100
Legionella longbeachae  5 2,900
Legionella pneumophila (Legionnaire’s Disease) 12,300
Leptospira canicola-Infectious Jaundice 1,9 6,000
Leptospira interrogans 1,5,9 6,000
Micrococcus candidus  4,9 12,300
Micrococcus sphaeroides 1,4,6,9 15,400
Mycobacterium tuberculosis  1,3,4,5,7,8,9 10,000
Neisseria catarrhalis  1,4,5,9 8,500
Phytomonas tumefaciens 1,4,9 8,500
Proteus vulgaris 1,4,5,9 6,600
Pseudomonas aeruginosa (Environ.Strain) 1,2,3,4,5,9 10,500
Pseudomonas aeruginosa (Lab. Strain) 5,7 3,900
Pseudomonas fluorescens 4,9 6,600
Rhodospirillum rubrum 5 6,200
Salmonella enteritidis 3,4,5,9 7,600
Salmonella paratyphi (Enteric Fever) 5,7 6,100
Salmonella Species  4,7,9 15,200
Salmonella typhimurium  4,5,9 15,200
Salmonella typhi (Typhoid Fever) 7 7,000
Salmonella 10,500
Sarcina lutea  1,4,5,6,9 26,400
Serratia marcescens  1,4,6,9 6,160
Shigella dysenteriae – Dysentery 1,5,7,9 4,200
Shigella flexneri – Dysentery 5,7 3,400
Shigella paradysenteriae  4,9 3,400
Shigella sonnei  5 7,000
Spirillum rubrum  1,4,6,9 6,160
Staphylococcus albus  1,6,9 5,720
Staphylococcus aureus  3,4,6,9 6,600
Staphylococcus epidermidis  5,7 5,800
Streptococcus faecaila  5,7,8 10,000
Streptococcus hemolyticus  1,3,4,5,6,9 5,500
Streptococcus lactis  1,3,4,5,6 8,800
Streptococcus pyrogenes 4,200
Streptococcus salivarius 4,200
Streptococcus viridans  3,4,5,9 3,800
Vibrio comma (Cholera) 3,7 6,500
Vibrio cholerae 1,5,8,9 6,500
Molds UV Light Dose
Aspergillus amstelodami 77,000
Aspergillus flavus  1,4,5,6,9 99,000
Aspergillus glaucus  4,5,6,9 88,000
Aspergillus niger  (breed mold) 2,3,4,5,6,9 330,000
Mucor mucedo 77,000
Mucor racemosus  (A & B) 1,3,4,6,9 35,200
Oospora lactis  1,3,4,6,9 11,000
Penicillium chrysogenum 56,000
Penicillium digitatum  4,5,6,9 88,000
Penicillium expansum  1,4,5,6,9 22,000
Penicillium roqueforti  1,2,3,4,5,6 26,400
Rhizopus nigricans (cheese mold)  3,4,5,6,9 220,000
Protozoa UV Light Dose
Chlorella vulgaris (algae) 1,2,3,4,5,9 22,000
Blue-green Algae 420,000
E. hystolytica 84,000
Giardia lamblia (cysts) 3 100,000
Nematode Eggs 6 40,000
Paramecium 1,2,3,4,5,6,9 200,000
Virus UV Light Dose
Adeno Virus Type III 3 4,500
Bacteriophage 1,3,4,5,6,9 6,600
Coxsackie 6,300
Infectious Hepatitis 1,5,7,9 8,000
Influenza 1,2,3,4,5,7,9 6,600
Rotavirus 5 24,000
Tobacco Mosaic 2,4,5,6,9 440,000
Yeast UV Light Dose
Baker’s Yeast 1,3,4,5,6,7,9 8,800
Brewer’s Yeast 1,2,3,4,5,6,9 6,600
Common Yeast Cake 1,4,5,6,9 13,200
Saccharomyces cerevisiae  4,6,9 13,200
Saccharomyces ellipsoideus  4,5,6,9 13,200
Saccharomyces sp.  2,3,4,5,6,9 24,000
  1. “The Use of Ultraviolet Light for Microbial Control”, Ultrapure Water, April 1989.
  2.  William V. Collentro, “Treatment of Water with Ultraviolet Light – Part I”, Ultrapure Water, July/August 1986.
  3.  James E. Cruver, Ph.D., “Spotlight on Ultraviolet Disinfection”, Water Technology, June 1984.
  4.  Dr. Robert W. Legan, “Alternative Disinfection Methods-A Comparison of UV and Ozone”, Industrial Water Engineering, Mar/Apr 1982.
  5. Unknown
  6. Rudolph Nagy, Research Report BL-R-6-1059-3023-1, Westinghouse Electric Corporation.
  7. Myron Lupal, “UV Offers Reliable Disinfection”, Water Conditioning & Purification, November 1993.
  8. John Treij, “Ultraviolet Technology”, Water Conditioning & Purification, December 1995.9. Bak Srikanth, “The Basic Benefits of Ultraviolet Technology”, Water Conditioning & Purification, December 1995

* Approximate – Various sources may report different inactivation dosages.