The Worst Pandemic in Modern History Arrives in Boston

The influenza pandemic of 1918 and 1919 killed somewhere between 50 and 100 million people worldwide. There were no antivirals, no flu vaccine, and no antibiotics for the pneumonia that often followed. Hospitals filled up fast. Doctors were left with very few tools and a lot of dying patients.

Boston was hit hard in the fall of 1918. Among the sick were hundreds of young sailors training in Boston Harbor for the merchant marine. Dr. William A. Brooks, Surgeon General of the Massachusetts State Guard and medical director for the recruits, noticed something about them. The sickest men had come from the worst-ventilated spaces: cramped, stuffy quarters below deck on ships, where the same stale air got breathed over and over.

Brooks drew a conclusion that sounds almost too simple. If bad air was making these men sicker, maybe the fix was to get them out of it.

A Hospital Made of Tents, on a Hill, in the Sun

With the city's hospitals already overwhelmed, Brooks enlisted the Massachusetts State Guard to build something unusual. On Corey Hill in Brookline, just outside Boston, they put up an open-air hospital made of tents. Patients were treated outside. On good days, they were moved out of the tents entirely and laid in the sunshine, bundled in blankets against the cold New England fall.

The staff paired the fresh air with strict hygiene and reusable cloth face masks. It was, in a sense, the opposite of everything the sailors had just come from.

According to the camp's records, 351 seamen were treated there, and all but 35 survived. Brooks believed that was a much better outcome than area hospitals were seeing. Open-air hospitals like his popped up around the country that year, and the idea wasn't new. Tuberculosis sanatoriums had been treating patients with fresh air and sun for decades.

Why It May Have Worked

In 2009, researchers Richard Hobday and John Cason dug into the Camp Brooks records and published their analysis in the American Journal of Public Health. Their conclusion: a combination of fresh air, sunlight, careful hygiene, and reusable masks appears to have substantially reduced deaths among patients and infections among medical staff.

Modern science helps explain why. Fresh, moving air dilutes whatever an infected person breathes out, so less of it reaches the next person. Sunlight does even more. It's a natural disinfectant. Research has shown simulated sunlight can inactivate influenza virus floating in the air, and sunlight kills many of the bacteria behind hospital infections. Military surgeons in the First World War already knew this. They routinely used sunlight to help heal infected wounds.

It's worth being honest about the limits. Camp Brooks wasn't a controlled clinical trial. The patients weren't randomly assigned, and hospital death rates in 1918 varied a lot. But the pattern, echoed by other open-air hospitals and by decades of tuberculosis care, points the same way. Stale indoor air helped disease. Fresh air and sunlight worked against it.

Then We Spent a Century Sealing the Windows

You'd expect a lesson like that to shape how buildings were designed for the next hundred years. Mostly, it went the other way.

Air conditioning spread through homes, offices, schools, and hospitals. After the energy crisis of the 1970s, buildings were sealed tighter to save on heating and cooling, and fresh-air intake was cut back. Windows that open became the exception in large buildings. Today people spend about 90 percent of their time indoors, breathing air that mostly gets recirculated through ductwork, not refreshed by the sky.

None of that was foolish. Sealed, climate-controlled buildings are comfortable and efficient, and they're essential in places like Florida in August. But in the process, we traded away the two things Brooks leaned on hardest: constant fresh air and disinfecting sunlight.

If You Can't Take People to the Sun, Bring the Disinfection to the Air

That's the idea behind ViroZap. It's the first FDA-cleared, Class II medical device engineered for in-duct air disinfection, developed by Dr. D. Yogi Goswami, a USF Distinguished University Professor and Florida Inventors Hall of Fame member. It installs into new or existing HVAC systems, so it treats the recirculated air that modern buildings depend on.

The Lesson Was Written in 1918. We Just Stopped Reading It.

Dr. Brooks didn't have a lab full of modern medicine. He had a hill, some tents, and an observation that the sickest men came from the stalest air. He acted on it, and most of his patients lived to go home.

We've since built a world that runs almost entirely indoors. That was a good trade for comfort and a bad one for the air. The answer isn't to tear down the walls. It's to give indoor air back what the sun and the open sky once gave it for free.

A century later, fresh-air thinking still works. It just needs a new address.