How did ventilation and clean wards help protect hospital patients from infectious disease?

During the Crimean War, Florence Nightingale implemented rigorous sanitary reforms at the military hospital in Scutari to combat high mortality rates. Her approach was largely influenced by the miasma theory, which posited that diseases were caused by "miasmas"—noxious vapors arising from decaying organic matter, stagnant water, and overcrowding.123

To protect patients, Nightingale and her nurses focused on the following environmental interventions:

• Ventilation: By opening windows, they sought to replace stagnant, foul-smelling air with fresh air, believing this would dilute or remove the disease-producing vapors that were thought to disrupt bodily functions.312
• Sanitation: They scrubbed walls and surfaces to remove accumulated filth and refuse, which were considered primary sources of miasmatic contamination.312
• Systematic Organization: By organizing medical supplies and ensuring basic necessities like clean clothing, dressings, and nourishing food, they created a more orderly environment that limited the opportunities for pathogens to spread.124

While these measures were based on an incorrect understanding of disease causation, they were highly effective in practice, leading to a dramatic decline in death rates by improving the overall sanitary conditions of the hospital.312