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What Microorganisms are Inactivated
by Germicidal Ultraviolet Light?

Incident energies at 253.7 nanometers (2537 Angstroms) necessary to inhibit colony formation in greater than 99% of microorganisms (measured in Microwatt Seconds per Square Centimeter)

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BacteriaUV Light Dose
Agrobacterium lumefaciens  58,500
Bacillus anthracis  1,4,5,7,9 (anthrax veg.)8,700
Bacillus anthracis  Spores (anthrax spores)*46,200
Bacillus megatherium  Sp. (veg) 4,5,92,500
Bacillus megatherium  Sp. (spores) 4,95,200
Bacillus paratyphosus  4,96,100
Bacillus subtilis  3,4,5,6,911,000
Bacillus subtilis  Spores 2,3,4,6,922,000
Clostridium tetani23,100
Clostridium botulinum11,200
Corynebacterium diphtheriae  1,4,5,7,8,96,500
Dysentery bacilli  3,4,7,94,200
Eberthella typhosa  1,4,94,100
Escherichia coli  1,2,3,4,96,600
Legionella bozemanii  53,500
Legionella dumoffill  55,500
Legionella gormanil  54,900
Legionella micdadei  53,100
Legionella longbeachae  52,900
Legionella pneumophila (Legionnaire’s Disease)12,300
Leptospira canicola-Infectious Jaundice 1,96,000
Leptospira interrogans 1,5,96,000
Micrococcus candidus  4,912,300
Micrococcus sphaeroides 1,4,6,915,400
Mycobacterium tuberculosis  1,3,4,5,7,8,910,000
Neisseria catarrhalis  1,4,5,98,500
Phytomonas tumefaciens 1,4,98,500
Proteus vulgaris 1,4,5,96,600
Pseudomonas aeruginosa (Environ.Strain) 1,2,3,4,5,910,500
Pseudomonas aeruginosa (Lab. Strain) 5,73,900
Pseudomonas fluorescens 4,96,600
Rhodospirillum rubrum 56,200
Salmonella enteritidis 3,4,5,97,600
Salmonella paratyphi (Enteric Fever) 5,76,100
Salmonella Species  4,7,915,200
Salmonella typhimurium  4,5,915,200
Salmonella typhi (Typhoid Fever) 77,000
Salmonella10,500
Sarcina lutea  1,4,5,6,926,400
Serratia marcescens  1,4,6,96,160
Shigella dysenteriae – Dysentery 1,5,7,94,200
Shigella flexneri – Dysentery 5,73,400
Shigella paradysenteriae  4,93,400
Shigella sonnei  57,000
Spirillum rubrum  1,4,6,96,160
Staphylococcus albus  1,6,95,720
Staphylococcus aureus  3,4,6,96,600
Staphylococcus epidermidis  5,75,800
Streptococcus faecaila  5,7,810,000
Streptococcus hemolyticus  1,3,4,5,6,95,500
Streptococcus lactis  1,3,4,5,68,800
Streptococcus pyrogenes4,200
Streptococcus salivarius4,200
Streptococcus viridans  3,4,5,93,800
Vibrio comma (Cholera) 3,76,500
Vibrio cholerae 1,5,8,96,500
MoldsUV Light Dose
Aspergillus amstelodami77,000
Aspergillus flavus  1,4,5,6,999,000
Aspergillus glaucus  4,5,6,988,000
Aspergillus niger  (breed mold) 2,3,4,5,6,9330,000
Mucor mucedo77,000
Mucor racemosus  (A & B) 1,3,4,6,935,200
Oospora lactis  1,3,4,6,911,000
Penicillium chrysogenum56,000
Penicillium digitatum  4,5,6,988,000
Penicillium expansum  1,4,5,6,922,000
Penicillium roqueforti  1,2,3,4,5,626,400
Rhizopus nigricans (cheese mold)  3,4,5,6,9220,000
ProtozoaUV Light Dose
Chlorella vulgaris (algae) 1,2,3,4,5,922,000
Blue-green Algae420,000
E. hystolytica84,000
Giardia lamblia (cysts) 3100,000
Nematode Eggs 640,000
Paramecium 1,2,3,4,5,6,9200,000
VirusUV Light Dose
Adeno Virus Type III 34,500
Bacteriophage 1,3,4,5,6,96,600
Coxsackie6,300
Infectious Hepatitis 1,5,7,98,000
Influenza 1,2,3,4,5,7,96,600
Rotavirus 524,000
Tobacco Mosaic 2,4,5,6,9440,000
YeastUV Light Dose
Baker’s Yeast 1,3,4,5,6,7,98,800
Brewer’s Yeast 1,2,3,4,5,6,96,600
Common Yeast Cake 1,4,5,6,913,200
Saccharomyces cerevisiae  4,6,913,200
Saccharomyces ellipsoideus  4,5,6,913,200
Saccharomyces sp.  2,3,4,5,6,924,000

Dislaimer: THE INFORMATION CONTAINED IN THIS PUBLICATION IS BASED UPON DATA COLLECTED BY THE ATLANTIC ULTRAVIOLET CORPORATION AND IS BELIEVED TO BE CORRECT. HOWEVER, NO GUARANTEE OR WARRANTY OF ANY KIND, EXPRESSED OR IMPLIED, IS MADE WITH RESPECT TO THE INFORMATION CONTAINED HEREIN. INFORMATION IS SUBJECT TO CHANGE WITHOUT NOTICE.

  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.

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Copyright © 1995–2021 Atlantic Ultraviolet Corporation. All rights reserved. The information and recommendations contained in this publication are based upon data collected by the Atlantic Ultraviolet Corporation and are believed to be correct. However, no guarantee or warranty of any kind, expressed or implied, is made with respect to the information contained herein. Specifications and information are subject to change without notice.