The Summer That Stilled Minnesota: Remembering the 1946 Polio Nightmare

It was a sweltering July in 1946 when Minnesota’s usual hum of summer activity fell eerily quiet. Pools that should have been teeming with kids were nearly empty, the State Fair—normally a riot of colour and sound—was called off, and parents huddled around kitchen tables, eyes darting to the newspaper for any mention of the spreading illness.

Poliomyelitis, then still called infantile paralysis, had been creeping up the nation for decades, but that summer the virus seemed to have hit a high‑octane gear. By the time the first wave hit Minneapolis, 92 people were already sick and seven had died. Hennepin County declared a state of emergency just a day before the city’s Aquatennial celebrations were slated to begin.

Mayor Hubert H. Humphrey, later to become a vice‑president of the United States, ordered a citywide quarantine two weeks later. The move felt desperate, almost theatrical, but it was a genuine attempt to stem a tide that seemed unstoppable.

Hospitals, especially the 65‑bed Sister Kenny Institute that specialised in polio care, were suddenly packed beyond capacity. The Institute, built to rehabilitate victims, found itself housing roughly 180 patients—more than double its intended load. Across town, the University of Minnesota’s medical centre filled up with children hooked up to iron lungs, those hulking metal contraptions that hissed with every breath they forced.

One such child was eight‑year‑old Darrow Nerdby of Montevideo. He sat on a thin hospital cot, his eyes bright despite the tubes and machines. Nurse Margaret Yackel gently secured his favourite toy to the iron lung, a small act of kindness that gave the boy—and his family—a sliver of normalcy amidst the nightmare.

At the time, doctors knew very little about how the virus traveled. The early symptoms masqueraded as a simple flu—low‑grade fever, headache, sore throat—making it hard to spot until the muscle weakness set in. Children, unfortunately, were the most vulnerable. "Polio was the victor after 35 years of research," a headline proclaimed in the Pioneer Press, highlighting both the frustration and the relentless pursuit of answers.

Researchers at the University of Minnesota were working feverishly, testing vaccines on monkeys and dissecting spinal cords under bright laboratory lights. Virologist Dr. Charles Evans told reporters that the first step was simply to understand the virus’s behaviour; only then could a cure be within reach.

The fear was palpable. Mary Pradt Ziegler, who later wrote about her mother’s battle with the disease in Wisconsin, remembered the summer as a time when “parents were panicky every summer, children whined about why they couldn’t go to the beach.” The anxiety wasn’t just local; small towns across the state sent patients to Twin Cities hospitals because they simply lacked the resources to handle an outbreak.

In St. Paul, the impact was just as severe. Ancker Hospital set up a dedicated polio quarantine ward; by mid‑November only a single eight‑year‑old girl remained there, a stark illustration of how the wave had finally receded. Yet in Minneapolis, hundreds still lingered, some confined to iron lungs, others coping with paralysis that would shadow them for the rest of their lives.

Education didn’t stop entirely. When public schools postponed the start of classes by two weeks, teachers teamed up with the university’s KUOM radio station to broadcast a “School by Air” series. Kids tuned in to lessons on geography, hygiene and even intercultural understanding, learning from the safety of their homes while the world outside fought an invisible enemy.

Polio’s grip on Minnesota would loosen, but not until the mid‑1950s. The 1955 introduction of Jonas Salk’s vaccine marked a turning point, turning the tide against a disease that had once seemed unstoppable. By 1956, the headline that made most parents smile was simply: “Polio cases drop.” It was a quiet triumph, far from the sensational headlines, but it meant that families could finally breathe easy again.

Looking back, the 1946 outbreak remains the deadliest polio episode in Minnesota’s history. More than 2,800 Minnesotans fell ill, and 226 lost their lives—most of them children whose futures were cruelly cut short. Yet the ordeal also forged a legacy of scientific determination, community solidarity, and public‑health lessons that echo even today.