Cleaners and Disinfectants as a Veterinary Workplace Hazard

Also see separate chapter Antiseptics and Disinfectants.

Veterinary personnel routinely use cleaning agents and disinfectants to decrease the transmission of infectious pathogens, maintain biosecurity, and provide a safe, hygienic environment for both animals and staff (1).

A cleaner is a substance designed to remove dirt, organic material, grease, and other contaminants from surfaces. Although cleaners act through physical and/or chemical mechanisms, they do not necessarily eliminate microorganisms. In contrast, a disinfectant is a chemical agent intended to kill or inactivate microorganisms on inanimate surfaces.

Effective infection control in veterinary settings typically involves a two-step process: thorough removal of organic matter using detergents, followed by the application of an appropriate disinfectant with sufficient contact time. The presence of organic material can appreciably decrease the efficacy of many disinfectants, making proper cleaning an essential prerequisite to disinfectant use.

Occupational exposure to cleaning and disinfecting agents is common in veterinary practice. Veterinarians and their staff can be exposed via multiple routes, including inhalation, dermal contact, ocular exposure, and, less commonly, ingestion.

Inhalation exposure to cleaners and disinfectants can occur when volatile substances are used, particularly in poorly ventilated areas or when sprays and aerosols are generated. Dermal exposure and ocular exposure most often result from direct contact during handling, dilution, application, or accidental spills. Although ingestion is rare, it can result from inadequate hygiene practices, such as eating or drinking without prior handwashing.

The extent of exposure to cleaners and disinfectants is influenced by several factors, including frequency and duration of use, product concentration, method of application (eg, spraying versus wiping), adequacy of ventilation, and the use (or lack) of appropriate personal protective equipment (PPE). Veterinary staff assigned routine cleaning duties or working in high-throughput clinical environments might be at increased risk.

Cleaning and disinfecting products encompass a wide range of chemical classes, each associated with distinct toxicological profiles. These agents can pose health risks not only to veterinarians and their staff but also to animal patients, particularly in cases of improper dilution or inadequate rinsing.

Health effects vary depending on the specific chemical, concentration, and exposure duration (see the table Common Classes of Cleaners and Disinfectants and Associated Health Effects).

Improper use or mixing of cleaning agents can generate hazardous by-products. For example, combining sodium hypochlorite (bleach) with ammonia produces chloramine gases, and mixing bleach with acids releases chlorine gas. Inhalation of chloramine or chlorine gas can cause acute respiratory distress, chest tightness, coughing, wheezing, and eye irritation. Severe exposures can result in chemical pneumonitis or pulmonary edema.

In veterinary environments, additional considerations regarding cleaning agents and disinfectants include species-specific sensitivities. For instance, phenolic disinfectants are particularly toxic to cats, and strong odors or residues from cleaning agents can cause stress or adverse reactions in hospitalized cats (1).

Occupational exposure to cleaners and disinfectants is widespread in veterinary practice and represents an appreciable but preventable health risk. The most commonly reported adverse effects include skin and eye irritation, respiratory symptoms, and chronic conditions such as occupational asthma.

The primary control methods for decreasing exposure to these products are substitution and prevention. Preventive measures include the following:

• training staff on safe handling and dilution of these agents

• using appropriate PPE (eg, gloves, eye protection, masks/respirators, where indicated)

• ensuring adequate ventilation in cleaning areas

• avoiding spray application where possible (favoring wipes or closed systems)

• following manufacturer instructions, particularly regarding contact time and dilution

• implementing standard operating procedures for cleaning and disinfection

A systematic approach to chemical safety, including risk assessment and adherence to workplace health guidelines, is essential to protect both veterinary personnel and animal patients.