We Didn’t Vanquish Polio. What Does That Mean for Covid-19?

I must have been unlucky to catch polio in Cork, Ireland, in 1956, as this was one of the last polio epidemics ever in Western Europe and the US. Jonas Salk had discovered a vaccine that had been successfully tested the previous year, and at the time I fell ill, mass inoculation was being rolled out for the first time to stop the spread of the virus in Chicago. Across the city, health workers took over vacant shops, the forecourts of gas stations, the backs of trucks, parks, and street corners to vaccinate people. The number of new infections declined as herd immunity was established, marking a turning point in the effort to stop epidemic polio. The success of this decades-long campaign was one of the greatest American achievements in the 20th century.

And yet again and again, just as polio appears to be close to elimination, it reappears—as it did with a case in July in Rockland County, N.Y., and earlier in the summer in London, where the virus was detected in the city’s sewage. What frightens the medical authorities is that they know that the great majority of people infected with polio show no symptoms but instead become unconscious carriers of the virus. By the time an outbreak is detected, it may be already out of control. Going by past experience, the fear generated by polio is greater than in the Covid-19 pandemic because it suddenly cripples its victims, who are usually children.

Polio has reemerged in Pakistan, where there have been 13 known cases since April and where Islamic militants killed three people carrying out door-to-door immunizations. Overconcentration on Covid-19 may have given the polio virus a fresh chance to spread, which it does quickly because—as with Covid-19—most carriers show few or no symptoms and only a minority of cases are severe or fatal.

I caught polio after an effective vaccine had been discovered, but it did me little good at the time since I wasn’t vaccinated. I was admitted to St. Finbarr’s fever hospital in Cork on September 30. When I was released three months later, I learned to walk again with metal calipers on my legs and a plastic waistcoat to keep my back straight. Though my mobility improved markedly over the years, I could not run and have always walked with a severe limp. I was conscious of my disabilities, but I never thought much about why this had happened to me or about the epidemic in general. I could not have said with any certainty—and this self-inflicted ignorance was to continue until I was well into middle age—in what year it had taken place or whether it was caused by a virus or by bacteria. I sensed that thinking about this, picking at the emotional scar tissue, was not going to help me. Only in the late 1990s, when I was in Iraq as a journalist talking to doctors and patients in ill-equipped hospitals hit by UN sanctions, did I start to find it strange that I knew more about sickness in Baghdad than I did about polio in Cork, when it had been me lying in that hospital bed.

And so I started reading about polio, a disease that has probably been around for thousands of years. There is an ancient Egyptian sculpture of a man with a wasted leg looking very much like my own. Walter Scott was made lame by it as a child. But these were individual cases, and it was not until the first half of the 20th century that polio epidemics began to sweep through cities. Before then most people contracted the virus in infancy, when their mother’s antibodies helped them to gain immunity. Long before the Covid-19 pandemic made the phrase “herd immunity” infamous, the pool of people who had polio without knowing it was large enough to prevent pandemics. It was modernity that gave the polio virus its chance: As 19th-century cities acquired clean water supplies and efficient drainage systems, babies were no longer contracting the virus in large enough numbers to provide protection. When collective immunity faltered, epidemics would surge periodically through cities like New York, Melbourne, Copenhagen, Chicago. Devastating though these outbreaks were, they seldom occurred at the same time in different places because vulnerability to the virus would vary.


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