Invited Commentary <\/p>\n\n\n\n
Infectious Diseases<\/p>\n\n\n\n
April 15, 2025<\/p>\n\n\n\n
The important study by Sutjipto et al1<\/a><\/sup> shows that deescalating personal protective equipment (PPE) requirements for COVID-19 can reduce cost and carbon impacts without compromising safety. This 24-month comparative study1<\/a><\/sup> measured COVID-19 incidence among health care workers in Singapore before and after a change in PPE guidance from gowns, face shields, gloves, and medical masks to N95 respirators alone. Their study showed no increase in COVID-19 incidence among hospital staff and a reduction in resource use; approximately 11.04 fewer disposable gowns used per patient-day, with corresponding reductions in carbon footprint and costs.1<\/a><\/sup><\/a><\/p>\n\n\n\n While focused on COVID-19, this work contributes to a broader discourse around an evolving understanding of transmission-based precautions.2<\/a><\/sup>,3<\/a><\/sup> Health care systems globally face the challenge of protecting staff from multiple transmission routes while minimizing the documented harms of overisolation and excessive PPE use: worse patient outcomes, more adverse events, longer lengths of stay, increased costs, more medical waste, and greater reliance on petroleum-based single-use plastics.4<\/a><\/sup>,5<\/a><\/sup> Meanwhile, emerging evidence points to the limited benefit of isolation gowns for infection control in many contexts.4<\/a><\/sup>,5<\/a><\/sup><\/a><\/p>\n\n\n\n The results from Sutjipto et al1<\/a><\/sup> point to a larger imperative: the need to align infection prevention practices with current evidence about transmission routes while considering their full environmental and operational impacts. Such alignment could transform PPE use across multiple pathogens, leading to more sustainable and efficient health care delivery without compromising safety. This is relevant as health systems seek to streamline operations, reduce their environmental footprint, and ensure quality care. As climate change intensifies, creating more frequent and overlapping health threats, the need for efficient, evidence-based resource utilization becomes critical.<\/a><\/p>\n\n\n\n Evolving Understanding of COVID-19 Transmission<\/p>\n\n\n\n Our understanding of pathogen transmission, including for COVID-19, has undergone a profound transformation since early 2020.2<\/a><\/sup>,3<\/a><\/sup> At the outset of the COVID-19 pandemic, the primary modes of transmission were thought to be respiratory droplets and fomite contact.1<\/a><\/sup>-3<\/a><\/sup> However, recent evidence illustrates the key role of COVID-19 transmission via the air spectrum or respiratory routes.3<\/a><\/sup> Consequently, public health recommendations have adapted to emphasize the importance of improved ventilation, air filtration, and the use of respirators to mitigate transmission on the air spectrum.2<\/a><\/sup>,3<\/a><\/sup> In this context, the utility of gowns as part of PPE for COVID-19 transmission is also being reevaluated.<\/a><\/p>\n\n\n\n Sutjipto and colleagues\u2019 study1<\/a><\/sup> provides crucial validation of this updated understanding of COVID-19 transmission. Their finding that deescalating contact precautions did not increase COVID-19 transmission among health care workers reinforces the primacy of respiratory protection.1<\/a><\/sup> This evidence supports a more targeted approach to PPE use, suggesting that resources might be better directed toward enhanced respiratory protection and air quality improvements rather than extensive contact precautions. This transformation in our understanding about COVID-19 dovetails with a broader reframing around respiratory virus transmission, challenging traditional assumptions about the relative importance of different transmission routes in health care settings.2<\/a><\/sup>,3<\/a><\/sup><\/a><\/p>\n\n\n\n Health Care Resilience and Sustainability<\/p>\n\n\n\n In recent decades, there has been a groundswell of interest in understanding and reducing the environmental impacts of health care delivery. Globally, health systems have a substantial climate impact and contribute to approximately 4.4% of global greenhouse gas emissions, the majority of which are from high-income countries.6<\/a><\/sup> Health care emissions have a tripartite categorization, the largest of which (scope 3) encompasses the health care supply chain.6<\/a><\/sup> This represents 70% of total sector emissions and includes PPE production, transport, use, and disposal.6<\/a><\/sup>The US health care system is notable as the leading contributor, accounting for 25% of total emissions while only serving approximately 4% of the world\u2019s population.6<\/a><\/sup><\/a><\/p>\n\n\n\n The COVID-19 pandemic brought these environmental challenges into sharp focus, exposing both the vulnerability of medical supply chains and generating unprecedented volumes of medical waste from increased PPE use.4<\/a><\/sup> This crisis intensified scrutiny of current infection control practices, including the utility and environmental impact of isolation precautions and PPE protocols.4<\/a><\/sup><\/a><\/p>\n\n\n\n Single-use plastics from PPE, primarily derived from petroleum products, create significant environmental impacts throughout their life cycle.7<\/a><\/sup> These impacts extend from manufacturing and transport to use and disposal.4<\/a><\/sup>,7<\/a><\/sup> Their manifold downstream impacts include microplastic pollution in waterways, and soil contamination from disposal.7<\/a><\/sup>The waste management challenges are particularly acute in health care settings, where PPE and contact precaution materials are classified as potentially infectious medical waste, requiring specialized disposal procedures that further amplify their environmental impact.7<\/a><\/sup> As health care systems face mounting pressure to reduce their climate impact while maintaining quality of care, optimizing PPE use represents a crucial opportunity for reducing scope 3 emissions.<\/a><\/p>\n\n\n\n Rethinking Infection Prevention Guidance<\/p>\n\n\n\n Infection control gowns have been a cornerstone of medical practice since the 19th century, with their use expanding significantly in response to multidrug-resistant organisms and novel pathogens. During the height of the COVID-19 pandemic, this led to unprecedented PPE consumption.<\/a><\/p>\n\n\n\n However, a robust and growing body of evidence challenges the widespread use of isolation gowns, revealing limited benefits and documented harms.1<\/a><\/sup>,2<\/a>,4<\/a><\/sup>,5<\/a>,7<\/a><\/sup> Multiple systematic reviews and meta-analyses have identified significant unintended consequences at both system and patient levels. Health care systems face substantial direct costs, increased lengths of stay, workflow inefficiencies, and excessive waste generation.4<\/a><\/sup>,5<\/a><\/sup> Patients experience reduced clinical contact, delayed care, increased adverse events including falls, and negative psychological impacts from isolation.4<\/a><\/sup>,5<\/a><\/sup><\/a><\/p>\n\n\n\n These findings necessitate a careful reassessment of transmission-based precautions across different pathogens, weighing theoretical benefits against documented harms and costs. Health care systems must transition toward evidence-based PPE implementation that considers transmission mechanisms, patient care quality, resource utilization, and environmental sustainability.<\/a><\/p>\n\n\n\n Emerging frameworks that clarify the predominant modes of transmission as either touch-based, air-based, or both can help ensure that PPE is used effectively and efficiently.2<\/a><\/sup>,3<\/a><\/sup> The urgency of this discourse is underscored by emerging infectious diseases that already have global reach, including the spread of highly pathogenic avian influenza.<\/a><\/p>\n\n\n\n Furthermore, future infection prevention strategies must emphasize upstream engineering controls alongside personal protection measures2<\/a><\/sup>,3<\/a><\/sup> Much as we benefited from the transformative impact of water and sanitation infrastructure alongside an emphasis on hand hygiene a century ago, enhanced indoor air quality through improved ventilation and filtration systems represents a critical and complementary approach to appropriate PPE for pathogens transmitted via the air spectrum.<\/a><\/p>\n\n\n\n Conclusions<\/p>\n\n\n\n