Enhancing vitamin D levels in care homes: the role of healthy building design in preventing respiratory infections

The recent article by Willcox et al. in the Journal of Public Health highlights the effectiveness of antiviral prophylaxis and high-dose vitamin D supplementation in reducing acute respiratory infections (ARIs) in care homes. This correspondence extends the discussion by emphasizing the critical role of healthy building design in enhancing vitamin D levels, which is vital for immune function and ARI prevention. Many care home residents suffer from vitamin D deficiency due to limited sunlight exposure. Incorporating architectural elements such as large windows, skylights, and outdoor spaces can significantly increase natural light exposure, thereby boosting vitamin D levels and potentially reducing ARI susceptibility. Despite the benefits of supplementation, addressing environmental factors through healthy building design offers a sustainable, long-term strategy that aligns with public health goals of preventive care and environmental sustainability. Prioritizing such design principles in care home planning and renovation can enhance residents' health and resilience against infections like influenza and COVID-19.