Evidence & Efficacy Library

Evidence Before Marketing

At KORRA, we believe disinfectant claims should be supported by evidence. The technology utilised within KORRA HygienTabs™ has undergone extensive independent testing against recognised European and British Standards (EN and BS EN) to evaluate efficacy against a broad range of microorganisms under both clean and dirty conditions. To date, the technology has been evaluated through more than 70 microbiological tests covering:

• Bacteria
• Viruses
• Yeast
• Fungi
• Mycobacteria
• Bacterial spores

Testing has been performed by independent accredited laboratories and research partners including:

• University College London Hospitals (UCLH)
• MSL
• BluTest
• IRM
• AA

This page provides an overview of the efficacy data supporting the technology behind KORRA HygienTabs™.

Why This Matters

Not all microorganisms are equally difficult to eliminate. Some bacteria and viruses can be controlled relatively easily, while others require significantly higher levels of antimicrobial activity. Particularly challenging organisms include:

• MRSA
• Pseudomonas aeruginosa
• Candida auris
• Adenovirus
• Parvovirus
• Mycobacteria
• Clostridioides difficile spores
• Bacillus spores

These organisms are routinely used during laboratory testing because they represent demanding microbial challenges. Demonstrating efficacy against highly resistant microorganisms provides confidence in a disinfectant’s overall performance.

 

Understanding PPM (Parts Per Million)

Throughout this Evidence & Efficacy Library, you will see disinfectant concentrations expressed as ppm. PPM stands for “Parts Per Million” and is used to describe the concentration of active disinfectant present within a solution. In simple terms, ppm tells us how much active disinfectant is available in the prepared solution. A higher ppm means a higher concentration of active disinfectant. However, a higher ppm does not automatically mean a better disinfectant. The effectiveness of a disinfectant depends on several factors working together, including:

• The active ingredient
• The concentration (ppm)
• The contact time
• The microorganism being tested
• Whether testing was conducted under clean or dirty conditions
• The log reduction achieved

For example, a highly effective disinfectant may achieve the same microbial reduction at 1,000 ppm that another disinfectant may only achieve at 5,000 ppm. This is why concentration should never be viewed in isolation. The full test result should always be considered.

 

Typical Concentrations Evaluated

Concentration	Typical Application
800 ppm	Broad-spectrum efficacy testing
1,000 ppm	Standard disinfection testing
2,000 ppm	Enhanced sporicidal testing
Higher concentrations	Specialist challenge and research testing

Different microorganisms require different challenge conditions and testing protocols, which is why multiple concentrations appear throughout this library.

 

Independent Research & Development

The technology behind KORRA HygienTabs™ has been investigated alongside healthcare microbiology specialists and researchers, including Professor Peter Wilson and the microbiology department at University College London Hospitals (UCLH). Particular focus has been placed on bacterial spores due to their exceptional resistance to conventional disinfectants. Researchers specifically selected spores because:

1. They represent a genuine infection-control challenge within healthcare environments.
2. They are among the most resistant microorganisms used in disinfectant testing.

If a disinfectant demonstrates efficacy against bacterial spores, it provides strong evidence of broad-spectrum antimicrobial capability.

 

Bactericidal Efficacy

EN 1276

Organism	Concentration	Contact Time	Conditions	Result
Acinetobacter baumannii	800 ppm	1 minute	Dirty	7.48 log
MRSA	800 ppm	1 minute	Clean	7.34 log
Pseudomonas aeruginosa	800 ppm	1 minute	Clean	7.65 log
Klebsiella pneumoniae	800 ppm	1 minute	Clean	7.59 log
Enterococcus hirae	800 ppm	5 minutes	Dirty	5.28 log
Escherichia coli	800 ppm	5 minutes	Dirty	5.32 log
Staphylococcus aureus	800 ppm	5 minutes	Dirty	5.25 log

EN 13697 Surface Testing

Organism	Concentration	Contact Time	Conditions	Result
Staphylococcus aureus	1000 ppm	5 minutes	Dirty	6.91 log
Enterococcus hirae	1000 ppm	5 minutes	Dirty	6.68 log
Escherichia coli	1000 ppm	5 minutes	Dirty	6.28 log
Pseudomonas aeruginosa	1000 ppm	5 minutes	Dirty	6.20 log

 

Additional Bactericidal Testing

Organism	Standard	Concentration	Contact Time	Result
Legionella pneumophila	EN 13623	800 ppm	60 minutes	4.19 log
Enterococcus hirae	EN 13727	800 ppm	5 minutes	5.25 log

 

 

Instrument Disinfection Efficacy

Instrument disinfection testing is particularly relevant for nail, beauty and podiatry professionals because it evaluates disinfectant performance on contaminated carriers designed to simulate reusable instruments.

EN 14561

Organism	Concentration	Contact Time	Conditions	Result
Enterococcus hirae	1000 ppm	5 minutes	Dirty	>5.85 log
Enterococcus hirae	2000 ppm	5 minutes	Dirty	>5.85 log
Pseudomonas aeruginosa	1000 ppm	5 minutes	Dirty	>5.03 log
Pseudomonas aeruginosa	2000 ppm	5 minutes	Dirty	>5.03 log
Staphylococcus aureus	1000 ppm	5 minutes	Dirty	>5.96 log
Staphylococcus aureus	2000 ppm	5 minutes	Dirty	>5.96 log

Virucidal Efficacy

EN 14476

Organism	Concentration	Contact Time	Conditions	Result
Feline Coronavirus (Coronavirus surrogate)	500 ppm	1 minute	Dirty	>4 log
Feline Coronavirus (Coronavirus surrogate)	1000 ppm	30 seconds	Dirty	>4 log
Feline Coronavirus (Coronavirus surrogate)	1000 ppm	1 minute	Dirty	>4 log
Feline Coronavirus (Coronavirus surrogate)	2000 ppm	30 seconds	Dirty	4 log
Feline Coronavirus (Coronavirus surrogate)	2000 ppm	1 minute	Dirty	>4 log
Adenovirus Type 5	800 ppm	5 minutes	Dirty	5.38 log
Canine Parvovirus	2000 ppm	5 minutes	Clean	5.33 log
Canine Parvovirus	2000 ppm	15 minutes	Clean	6.83 log

EN 14675

Organism	Concentration	Contact Time	Result
Feline Calicivirus	2000 ppm	5 minutes	4 log
Feline Calicivirus	4000 ppm	5 minutes	4.67 log
Feline Calicivirus	6000 ppm	5 minutes	4.67 log

Fungicidal & Yeasticidal Efficacy

EN 1650

Organism	Concentration	Contact Time	Conditions	Result
Candida auris	2000 ppm	30 seconds	Dirty	4.26 log

 

EN 13624

Organism	Concentration	Contact Time	Conditions	Result
Candida albicans	800 ppm	5 minutes	Dirty	>4.46 log
Candida albicans	1600 ppm	5 minutes	Dirty	>4.46 log
Aspergillus brasiliensis	3200 ppm	15 minutes	Dirty	4.42 log

EN 14562

Organism	Concentration	Contact Time	Conditions	Result
Candida albicans	1000 ppm	5 minutes	Dirty	4.46 log
Candida albicans	1000 ppm	15 minutes	Dirty	4.64 log
Aspergillus brasiliensis	4000 ppm	15 minutes	Dirty	4.08 log

Mycobactericidal Efficacy

EN 14204

Organism	Concentration	Contact Time	Conditions	Result
Mycobacterium avium	1000 ppm	60 minutes	Dirty	6.13 log
Mycobacterium terrae	1000 ppm	60 minutes	Dirty	6.19 log

Sporicidal Efficacy

Bacterial spores are among the most resistant forms of microbial life. Unlike many bacteria and viruses, spores are specifically designed to survive drying, chemical exposure and environmental stress. For this reason, sporicidal efficacy is often regarded as one of the most demanding measures of disinfectant performance.

Latest BS EN 17126:2018 Results

Recent testing demonstrated validated sporicidal efficacy at standard-use concentration under dirty conditions.

Organism	Concentration	Contact Time	Conditions	Result
Clostridioides difficile	1000 ppm	5 minutes	Dirty	>4 log
Bacillus subtilis	1000 ppm	5 minutes	Dirty	>4 log
Bacillus cereus	1000 ppm	5 minutes	Dirty	>4 log

This is particularly significant because BS EN 17126 is a medical-area sporicidal standard specifically designed to evaluate disinfectants against highly resistant bacterial spores.

Additional Sporicidal Testing

EN 13704

Organism	Concentration	Contact Time	Conditions	Result
Clostridioides difficile	2000 ppm	5 minutes	Dirty	>4.41 log

 

 

ASTM E2197

Organism	Concentration	Contact Time	Conditions	Result
Clostridioides difficile	3567 ppm	2 minutes	Dirty	4.5 log
Clostridioides difficile	5166 ppm	2 minutes	Dirty	6.2 log
Clostridioides difficile	5166 ppm	5 minutes	Dirty	6.55 log

UCLH Research Findings

Research conducted with University College London Hospitals investigated efficacy against highly resistant Clostridioides difficile spores under demanding conditions.

Organism	Concentration	Contact Time	Conditions	Result
C. difficile spores	800 ppm	1 minute	Clean	3.75 log
C. difficile spores	800 ppm	5 minutes	Clean	4.16 log
C. difficile spores	800 ppm	15 minutes	Clean	7.33 log

Additional UCLH testing demonstrated:

Organism	Concentration	Contact Time	Result
MRSA	800 ppm	1 minute	7.34 log
Pseudomonas aeruginosa	800 ppm	1 minute	7.65 log
Klebsiella pneumoniae	800 ppm	1 minute	7.59 log
Acinetobacter baumannii	800 ppm	1 minute	7.48 log

These results demonstrate exceptionally high levels of microbial reduction against a range of clinically significant challenge organisms.

 

Summary Of Efficacy

The technology utilised within KORRA HygienTabs™ has demonstrated efficacy against:

Bacteria

• MRSA
• Pseudomonas aeruginosa
• Escherichia coli
• Staphylococcus aureus
• Enterococcus hirae
• Klebsiella pneumoniae
• Acinetobacter baumannii
• Legionella pneumophila

Viruses

• Coronavirus surrogates
• Adenovirus
• Parvovirus
• Calicivirus

Yeast & Fungi

• Candida albicans
• Candida auris
• Aspergillus brasiliensis

Mycobacteria

• Mycobacterium avium
• Mycobacterium terrae

Bacterial Spores

• Clostridioides difficile
• Bacillus subtilis
• Bacillus cereus

 

Our Commitment To Transparency

At KORRA, we believe professionals deserve access to evidence, not just marketing claims. The technology behind KORRA HygienTabs™ continues to be evaluated through recognised testing standards, independent laboratories and real-world professional use. Because professional hygiene should always be built on evidence, transparency and trust.