FAQ Disinfection in veterinary clinics: 10 essential questions about safety and compliance

In a veterinary practice, every day brings different patients, varied pathologies, and distinct levels of biological risk. A dog with parvovirus, a post-operative cat, or an animal admitted for routine investigations all use the same spaces, the same examination tables, and often the same staff. If you do not correctly manage cleaning and disinfection, you increase the risk of cross-contamination, healthcare-associated infections, and non-compliance during DSVSA inspections.

1. What does correct disinfection in a veterinary practice mean, and why does it matter so much?

Correct disinfection in a veterinary environment does not mean simply applying a product to a surface. It means a structured process with three distinct and mandatory stages, applied in order.

Cleaning removes visible dirt and organic matter: blood, secretions, feces, urine, food debris, hair, and exudates. Without this stage, the active substances in the disinfectant cannot act at the declared parameters. Proteins and fats in organic matter inactivate quaternary ammonium compounds, reduce the efficiency of hydrogen peroxide, and can prevent the solution from penetrating the biofilm. Disinfecting uncleaned surfaces is ineffective and legally non-compliant.

Disinfection reduces the microbial load to a level considered safe for use. The level of disinfection is chosen based on the risk associated with the surface or device:

• low level — bactericidal, yeasticidal, virucidal against enveloped viruses;

• intermediate level — adds mycobactericidal/tuberculocidal activity;

• high level — covers all microorganisms, including non-enveloped viruses and, under certain conditions, bacterial spores.

Sterilization destroys all forms of microbial life, including the most resistant bacterial spores. It applies to critical instruments that penetrate sterile tissues or the vascular system.

Specific risks to the veterinary environment that the protocol must cover:

• Canine Parvovirus (CPV-2): a non-enveloped virus, extremely resistant in the environment (surviving for months or even over a year on surfaces under optimal conditions). Alcohol alone is not effective; it requires virucidal products tested according to EN 14476 with demonstrated activity against non-enveloped viruses, or sporicidal/peroxide-based products. Diluted sodium hypochlorite (1:30, minimum 10 minutes of contact) or potassium peroxymonosulfate-based products are effective against CPV-2.

• Dermatophytosis (Microsporum canis, Trichophyton mentagrophytes): direct zoonotic risk to staff; requires products with proven fungicidal activity (EN 13624, EN 14562).

• Leptospira spp.: severe zoonotic risk; sensitive to most common disinfectants, but requires rigorous prior cleaning, as leptospires survive in moist environments contaminated with urine.

• Toxoplasma gondii: oocysts are resistant in the environment; a relevant zoonotic risk, especially for immunocompromised staff and pregnant employees.

• Veterinary MRSA and resistant Enterobacteriaceae: documented in veterinary practices, transmissible between animals and staff.

During a DSVSA inspection, inspectors verify both procedures and evidence of their implementation. A correctly applied disinfection that is not documented is difficult to prove.

2. What legal obligations regarding veterinary practice disinfection must you meet for authorization?

Veterinary medical units operate under a dual legal framework: specific veterinary regulations managed by ANSVSA and legislation regarding biocidal products, which is shared with human medical units.

The legal framework applicable to veterinary practices:

• ANSVSA Order no. 10/2024 regarding the registration/authorization procedure for animal health and welfare units: a recent regulatory act that updates authorization conditions, including requirements for sanitization and disinfection of veterinary spaces.

• Regulation (EU) no. 528/2012 concerning the making available on the market and use of biocidal products: all disinfectant products used must be authorized according to this regulation and, in Romania, registered in the National Register of Biocidal Products. According to Annex V, products intended for veterinary hygiene (disinfection of surfaces, materials, and equipment associated with the housing, transport, or treatment of animals) fall under Product-Type 3 (PT3).

• GEO no. 41/2019 on the approval of active substances and the authorization of biocidal products in Romania: the mandatory requirement to use exclusively products approved by the competent authority.

• GD no. 617/2014 and subsequent amendments: the institutional framework for implementing Regulation (EU) no. 528/2012.

• Order no. 10/2010, amended by Order no. 2217/2023: the authorization procedure for biocidal products.

• SR EN 14885:2022: the European reference standard for evaluating the effectiveness of disinfectants; the products used must be tested according to relevant EN standards for the declared spectrum.

• MS Order no. 1226/2012: management of hazardous medical waste (also applicable to veterinary practices by analogy and through the mandatory contract with an authorized biohazard waste collection company).

Mandatory documents for DSVSA inspection:

• a written cleaning and disinfection plan, adapted for each area of the practice;

• standard operating procedures (SOPs) per area: consultation room, surgical suite, hospitalization area, reception;

• a daily cleaning and disinfection log;

• technical data sheets and safety data sheets (SDS) for all biocidal products used;

• evidence of staff training (signature, date, covered topics);

• a valid contract with an authorized company for the collection and disposal of hazardous biohazard waste.

DSVSA inspectors frequently ask for proof for each product: which product, at what concentration, what contact time, when it was applied, and who was responsible. Without complete documentation, correct practice becomes impossible to prove.

3. Which disinfectant products should you choose for a veterinary practice and how do you adapt them to the specific risk?

4. How often should surfaces be disinfected and how do you layer the frequency?

The frequency of disinfection is determined according to the epidemiological risk level of each area and each type of patient, not uniformly. Applying the same treatment everywhere wastes time and resources.

5. How do you correctly manage spills of blood and biological fluids?

Immediate intervention is mandatory; do not delay cleaning and do not cover the area directly with disinfectant without first removing the organic matter.

7-step protocol, in strict order:

1. Full equipment: nitrile gloves, waterproof gown, eye protection. Do not intervene without complete PPE.

2. Isolate the area: restrict access for other people and animals.

3. Apply absorbent disposable material (paper towels, pads) and collect everything into a biohazard waste bag.

4. Do not pour disinfectant directly over organic matter: the active substance is inactivated; this results in incomplete disinfection and an unjustified consumption of product.

5. Clean mechanically: apply a detergent-degreaser or enzymatic detergent and remove visible residue with a disposable cloth or absorbent material.

6. Apply the PT3 approved disinfectant, at the concentration and contact time corresponding to the risk; respect the concentration and full contact time from the technical data sheet; do not wipe prematurely.

7. Hand hygiene after removing gloves; collect all used material in biohazard waste.

6. What logs and documents must you keep for compliance during a DSVSA inspection?

Correct documentation provides internal traceability and protection during an inspection. A practice that applies correct procedures but does not document them is vulnerable to sanctions.

Mandatory documents:

1. Daily Cleaning and Disinfection Log: completed in real-time, not at the end of the day or retrospectively; it must contain, for each intervention: date and time, the surface or area treated, the product used (trade name, approval number), concentration, contact time, and the person responsible (signed by name).
2. Record of dilutions for concentrated products: note the date of preparation, prepared concentration, prepared volume, and the solution's shelf life, according to the disinfectant's technical data sheet. It is mandatory to label any container holding a prepared solution — name, concentration, date, and time of preparation.
3. Technical Data Sheets and SDS: physically available at the point of use for every biocidal product in stock; updated to the current version.
4. Annual Sanitation Plan: a strategic document that covers disinfection frequencies per area, products used, and responsibilities.
5. Evidence of staff training: date, covered topics, participant signatures; kept for at least 5 years.
6. Contract with an authorized biohazard waste company: valid, with records of transfer/handover documents (hazardous waste transport forms).

Archive documents so that they are accessible within a maximum of 15 minutes upon request by DSVSA inspectors.

7. How is the disinfection of reusable veterinary instruments performed correctly?

Reusable veterinary instruments are processed through a protocol with three mandatory and consecutive phases, identical in principle to that used in human medicine. Omitting any phase or reducing contact times compromises the entire process.

Classification of veterinary instruments (based on patient contact):

• Critical: penetrate sterile tissues or the vascular system: scalpels, suture needles, vascular catheters, puncture needles, implants. Mandatory sterilization by autoclave (134°C/3–5 min) or, for heat-sensitive items, chemical cold sterilization.

• Semi-critical: contact with intact mucous membranes or non-intact skin: laryngoscopes, reusable endotracheal tubes, ear specula, reusable nasogastric tubes. High-level disinfection as a minimum; sterilization recommended whenever possible.

• Non-critical: contact with intact skin or frequently handled by staff: stethoscope, rectal thermometer (with protective sheath), handling forceps. Intermediate-level disinfection, high-level in special situations.

The 3 mandatory phase protocol:

Phase 1: Enzymatic cleaning (immediately after use):

• Immerse instruments in a 0.01%–0.5% Klinozyme solution immediately after use, without letting biological residues dry.

• Dismantle movable parts before immersion.

• Contact time: 5 minutes (medium soil) or 15 minutes (heavy soil: blood, tissue).

• Clean with a soft brush for hard-to-reach areas; an ultrasonic bath complements mechanical cleaning.

• Rinse with warm water (20–45°C; no hotter, to avoid coagulating residual proteins).

Phase 2: Intermediate-level disinfection:

• Immerse instruments completely in solution

• Instruments must be completely covered by the solution, with no air bubbles in the channels.

• Document: name, concentration, date, and time of preparation.

Phase 3: High-level disinfection

• Instruments must be completely covered by the solution, with no air bubbles in the channels.
• Document: name, concentration, date, and time of preparation.

• Rinse with sterile or distilled water; dry completely before packaging.

Phase 4: Thermal sterilization (for critical heat-resistant instruments):

• Class B autoclave, 134°C, 3–5 minutes.

• Package in paper-plastic bags compliant with EN ISO 11607 with an internal chemical indicator.

• Label with date, cycle, and expiration date.

• Mandatory documentation in the sterilization logbook.

8. How do you train veterinary staff to comply with disinfection standards?

Training is the legal obligation of the unit manager and a condition for compliance during DSVSA (National Sanitary Veterinary and Food Safety Authority) inspections. It is not enough to have written procedures if the staff does not know them or does not apply them correctly.

Mandatory training moments:

• upon hiring: before the first independent contact with patients or instruments;

• annually: review and update of protocols;

• upon the introduction of any new product into the facility;

• after any incident or non-compliance identified during an audit.

9. What are common mistakes that lead to sanctions or non-conformities during DSVSA inspections?

Mistake 1: Lack of written procedures or outdated procedures

Clinics without written SOPs or with procedures that do not reflect the current reality of the space and products used are in structural non-compliance. Update documents whenever you change a product, reorganize the space, or a new piece of legislation is issued.

Mistake 2: Use of products without a valid biocidal authorization or with incorrect PT categorization

Household products, products with an expired authorization, or using a product authorized for a different type (e.g., general-purpose PT2) instead of a product specifically authorized as PT3 for the veterinary field are not legally compliant. Verify the entry of each product in the National Register of Biocidal Products, the product type (PT) from the authorization, and the expiration date before purchasing and periodically thereafter.

Mistake 3: Incorrect dilutions

Dilution below the recommended level reduces efficacy below the level declared in EN tests and may favor the selection of resistant strains. A more concentrated dilution generates toxicity, corrosion, and unnecessary costs. Implement controlled dosing systems: graduated syringes or dedicated automatic diluters.

10. How do you build an effective disinfection plan for a new veterinary clinic?

Disinfection planning begins at the space layout stage, not after opening. Clean and dirty flows must be physically demarcated and must not cross.

1. Mapping risk zones

Identify and classify each zone by epidemiological risk: surgery and invasive procedures room (high risk), hospitalization area (medium-high risk), consultation room (medium risk), reception and office (low-medium risk). Establish a unidirectional dirty-to-clean flow.

2. Selecting products per zone and per application

• Surgery area: high-level disinfectant for surfaces + terminal disinfection via nebulization; instruments — the 3-phase protocol.

• Hospitalization area: daily medium-high level + high level upon discharge; terminal disinfection with nebulization after outbreaks.

• Consultation room: medium level after each patient.

Do not choose products based solely on the price-per-liter criterion. Calculate the cost per applied dose and evaluate the spectrum, material compatibility, and available documentation.

3. Drafting documents before opening

• Cleaning and disinfection plan (strategic document with frequencies per zone).

• SOPs for each type of intervention.

• Cleaning/disinfection log (ready-made format, ready to be filled out).

• Sterilization log (if you have an autoclave).

4. Training the team before the first patient

Training cannot be postponed. The protocol must be applied correctly from the very first patient.

5. Periodic internal auditing

Three months after opening, perform an internal audit: verify whether the written protocols reflect actual practice, whether documents are completed correctly, and whether there are any non-conformities to be corrected before the first DSVSA inspection.