infection prevention

Hospital Disinfection and the Evolving WHMIS/GHS Standards

Gaétan Lanthier

A Framework in Constant Evolution

The Workplace Hazardous Materials Information System (WHMIS), aligned with the Globally Harmonized System (GHS), has significantly transformed in recent years. These updates modernized the classification of hazardous materials, introduced standardized pictograms, and revamped safety data sheets (SDS). In hospital settings, where infection prevention depends heavily on effective and safe use of disinfectants, staying current with WHMIS/GHS is more than a compliance issue—it’s essential to operational safety and patient well-being.

Implications for Environmental Services Teams

Disinfection personnel in healthcare facilities routinely handle chemical agents such as sporicidal disinfectants, acidic cleaners, and degreasers. WHMIS 2015 requires them to interpret new labels, understand standardized hazard statements, and consult the SDS format organized into 16 clear sections. A lack of awareness could result in improper use, leading to chemical exposure or compromised disinfection outcomes.

Training and Integration into Daily Protocols

To ensure safe and effective application of disinfectants, continuous training is required. Environmental services workers must be familiar with the identification of risks, safe product handling, PPE selection, and emergency measures in case of spills or exposure. Visual aids, clearly posted SDS, and regular refreshers help translate WHMIS/GHS principles into routine hospital disinfection practices.

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Understanding Disinfectant Residual Efficacy in Healthcare Environments

Gaétan Lanthier

Residual Action: Protection Beyond the Initial Application

In hospital settings, disinfection is not only about immediate germ elimination. Some disinfectants offer a critical advantage: residual efficacy. This refers to their ability to continue killing or inhibiting microorganisms on surfaces even after the product has dried. In high-touch or high-risk zones, such as ICUs and surgical wards, this property helps maintain protection between cleaning cycles.

Key Factors for Effective Residual Disinfection

Residual efficacy depends on several elements. The product must remain stable after application, resist organic soils, and retain antimicrobial power across various surface types. Some formulations achieve this through advanced polymers or encapsulation technologies, offering prolonged action against bacteria, viruses, and spores. In healthcare environments, this contributes to reducing hospital-acquired infections (HAIs) even after staff or patients have come into contact with surfaces.

Benefits and Considerations

The main benefit of residual disinfectants is their ability to reduce recontamination between manual cleanings. This leads to enhanced surface hygiene, better infection control, and reduced workload. However, residual efficacy doesn’t replace thorough cleaning. Soils can inhibit the disinfectant’s action, and not all residual products are suitable for every healthcare setting. Proper selection and integration into protocols are essential.

Strategic Role in Infection Prevention

When used correctly, residual disinfectants are a valuable part of a layered approach to infection prevention. They are particularly useful in areas with frequent contact and high microbial risk. By maintaining a persistent antimicrobial barrier, they support healthcare workers in their efforts to create safer care environments.

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