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EN 16438 Test

Evaluate Fungicidal or Yeasticidal activity of Chemical disinfectants and Antiseptics

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BS EN 16438 : 2014 – Quantitative surface test for the evaluation of fungicidal or yeasticidal activity of chemical disinfectants and antiseptics used in the veterinary area on non-porous surfaces without mechanical action (phase 2, step 2)

EN 16438 is a (phase 2, step 2) carrier test to assess fungicidal or yeasticidal activity of chemical disinfectants and antiseptics for use on non-porous surfaces in veterinary areas. 

EN 16438 stimulates real conditions, which allows to better understand the potential of given products for their actual usage. Fungicidal or yeasticidal activity of the product is assessed on a non-porous (carrier) surface without mechanical action.

EN 16438 Test Conditions & Requirement

EN 16438 (phase 2, step 2)

Yeasticidal activity on nonporous surfaces without mechanical action

Fungicidal activity on nonporous surfaces without mechanical action


Mandatory test    microorganisms 

Candida albicans (ATCC 10231)

Candida albicans (ATCC 10231),

Aspergillus niger (ATCC 16404) (formerly Aspergillus Brasiliensis) 

Test temperature 

10 °C ± 1 °C

10 °C ± 1 °C

Contact times 

60 min ± 10 s

60 min ± 10 s 

Interfering substance

Low level soiling 

3,0 g/l bovine albumin

3,0 g/l bovine albumin

High level soiling

10 g/l yeast extract plus 10 g/l bovine albumin

10 g/l yeast extract plus 10 g/l bovine albumin

Passing criteria

≥ 3

≥ 3

EN 16438 test process

EN 16438 Test Method

  • A test suspension of  microorganisms with interfering substance is inoculated onto a metal disc surface (carrier) and allowed to dry.
  • Test product is evenly spread over the dried culture of test microbes. The carrier surface with the test product is kept for a recommended contact period and temperature . 
  • At the end of contact time, the carrier is immersed in a solution to neutralize fungicidal/yeasticidal action of the test product.
  • The number of recovered microorganisms in neutralizing solution is enumerated using plate count technique.
  • Results are concluded by comparing the number of viable microorganisms examined on treated surface with microbial count from surface treated with water (instead of disinfectant).

Importance of EN 16438 Test

In veterinary settings, fungal and yeast persistence on inanimate surfaces can make veterinarians, staff, and even animals more susceptible to infection. Therefore, disinfection is a crucial practice to ensure sanitation and infection control.

As per European norms, veterinary disinfectants claiming fungicidal or yeasticidal must be tested for their efficacy under standardized methods. EN 16438 standard is established to check microbicidal activity of product samples against Candida Albicans and Aspergillus niger under conditions mimicking situations for their respective area of application.

At MIS, we provide both customized and standardized efficacy testing solutions that come within the scope of EN 16438 standard.

In our state-of-the-art testing facilities, microbiological analysis is undertaken by our highly skilled staff who have extensive experience  in microbiome research, classical microbiology techniques, methodology, and technical analysis. Additionally, clients can also send their test samples for EN 1650 testing in our labs.

To request a quote for EN 16438 or want to know more about our services, contact our experts today.


EN 16438 is a quantitative non-porous surface test for chemical disinfectants and antiseptics used in the veterinary areas without mechanical test. To pass EN 16438, test product must show at least 3 log reductions for reference microorganisms as a minimum measure of efficacy.

EN 16438 test is applicable to chemical disinfectants and antiseptics that are designed to be used for disinfection of non – porous surfaces in veterinary settings.

EN 16438 test takes 2-3 weeks to complete.

At Microbe Investigations, we test for EN 16438 using the following microbial strains: Candida Albicans (MTCC 3017) and Aspergillus niger (ATCC-16888). However, other test organisms can also be used as per the client’s request.

Contact us for more information

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