Hoping for a Covid Vaccine and Recalling the One for Smallpox

As many people check the news compulsively for even the smallest positive word on vaccine development, we are at an anniversary moment in vaccine history. We are between the anniversary of the day — May 14, 1796 — that Edward Jenner inoculated 8-year-old James Phipps with cowpox virus, and the day — July 1, 1796 — that he tested his new process by inoculating the same child with smallpox virus, to find out whether he was protected.

This is the season in which that experimental vaccine was doing its work in the child’s immune system, 224 years ago. Although that is not the kind of nice round anniversary number we usually celebrate, it’s worth reflecting on the biologic brilliance of the technique, on the ethics of vaccine development and testing, then and now, and above all, on what our bodies and immune systems are capable of doing, when appropriately prompted.

Because whatever the scientific brilliance involved in vaccine development — and we are watching an unprecedented level of inventiveness, improvisation, adaptation and cooperation now in the current Covid science — successful vaccine development amounts to our human entrepreneurial capacities allowing us to turn on a system that we certainly did not build ourselves, though we recreate it from our internal instruction sheets every time an infant is born.

Smallpox, caused by the Variola virus, stalked and killed humans for millenniums, leaving traces on the mummies of Egyptian pharaohs (it did not respect high rank) and in the ancient texts of China and India. It came into Europe four or five centuries before the Common Era, and Europeans brought it to the New World, where it devastated the Indigenous populations.

It killed anywhere from 20 percent to 60 percent of the people who were infected, left most of the survivors badly scarred, and a third of them blind. Mortality was higher among children, and almost all infected infants died.

Before there was any way to protect against smallpox, people did understand that those who had the disease and recovered would not get sick again, even if they were exposed to the disease. Building on this observation, before vaccination, there was variolation, a technique in which smallpox was deliberately introduced into the body of someone who had never had the disease, either by blowing dried scabs up the nose or by inoculating pus from a pustule.

Variolation was practiced in Africa and in Asia. Lady Mary Wortley Montagu, the wife of the British ambassador in Constantinople, her own face scarred by smallpox, had her young son inoculated by variolation in 1718, and brought news of the technique back to Europe.

It arrived in the New World as a practice known to some of the enslaved people brought from Africa; one of them, Onesimus, taught Cotton Mather about the practice, and Mather, a Puritan minister best remembered today for his role in the Salem witch trials, used the technique in a 1721 smallpox epidemic in Boston.

Variolation did confer immunity, when it worked, but it was a risky technique, with a mortality rate of 2 percent; people could develop full blown smallpox, or could spread the infection to others. The great human invention involved in vaccination, instead, was to turn on the immune system just as effectively with something that was not actually live potent smallpox virus.

The person widely credited with that invention, Edward Jenner, was a British country doctor. As a child in Gloucester, he had been successfully inoculated with smallpox virus. He was not the only one to take note of the observation that women who worked in dairies and contracted the much milder infection of cowpox — caused by the Vaccinia virus, named for vacca, the Latin word for cow — were immune to smallpox. In fact, he was not the first to try using the cowpox virus to protect against smallpox, but he was the one who made an experiment of it, published his results, and took it on as a crusade.

The virus he used came from a dairymaid, Sarah Nelmes, who got it from a cow named Blossom. In May of 1796, Jenner inoculated the 8-year-old James Phipps, the son of his gardener, and carefully recorded the symptoms, as the boy developed low-grade fever, swollen lymph nodes under his arm, loss of appetite — and then recovered.

And then in July, Jenner inoculated him with smallpox, and he did not get sick. Jenner published his work a few years later. The practice spread in both Europe and the United States, although there was also controversy, right from the beginning, about whether it was dangerous, and whether it could — or should — be made compulsory.

Of course, medical research standards have evolved since then. “His experiment would be completely condemned, even though it demonstrated something of importance on a par with fighting today’s plague,” said Arthur Caplan, a bioethicist at NYU Langone Medical Center. “He used a poor kid, who didn’t consent or volunteer, his father ‘volunteered’ him to please his employer.”

Still, Dr. Caplan has supported the idea of human challenge trials for a new coronavirus vaccine, that is, of deliberately exposing vaccinated volunteers to the disease. “We’ve evolved an ethical framework that would make it more acceptable,” he said. “Giving the disease after you vaccinate is not inherently always wrong — it’s how you do it, how you select the person.”

What was happening in 1796 inside the body of James Phipps was something for which Jenner had no vocabulary, a highly complex immune process which has only begun to be teased out over the past 20 years.

The vaccinia virus turned on an intricate “cascading network of integrated immune pathways,” scientists wrote in a 2009 article. And then the vaccinated person was left with a group of white blood cells, a “small, long-lived memory population capable of responding to subsequent infection.” That’s vaccination — isn’t it beautiful?

As for Jenner, he set up a clinic in a small garden cottage, calling it the “Temple of Vaccinia,” and offered free vaccination to the poor. His own family was blighted by a different microbe; tuberculosis killed his son and his wife

  • Frequently Asked Questions and Advice

    Updated May 26, 2020

    • How can I protect myself while flying?

      If air travel is unavoidable, there are some steps you can take to protect yourself. Most important: Wash your hands often, and stop touching your face. If possible, choose a window seat. A study from Emory University found that during flu season, the safest place to sit on a plane is by a window, as people sitting in window seats had less contact with potentially sick people. Disinfect hard surfaces. When you get to your seat and your hands are clean, use disinfecting wipes to clean the hard surfaces at your seat like the head and arm rest, the seatbelt buckle, the remote, screen, seat back pocket and the tray table. If the seat is hard and nonporous or leather or pleather, you can wipe that down, too. (Using wipes on upholstered seats could lead to a wet seat and spreading of germs rather than killing them.)

    • What are the symptoms of coronavirus?

      Common symptoms include fever, a dry cough, fatigue and difficulty breathing or shortness of breath. Some of these symptoms overlap with those of the flu, making detection difficult, but runny noses and stuffy sinuses are less common. The C.D.C. has also added chills, muscle pain, sore throat, headache and a new loss of the sense of taste or smell as symptoms to look out for. Most people fall ill five to seven days after exposure, but symptoms may appear in as few as two days or as many as 14 days.

    • How many people have lost their jobs due to coronavirus in the U.S.?

      Over 38 million people have filed for unemployment since March. One in five who were working in February reported losing a job or being furloughed in March or the beginning of April, data from a Federal Reserve survey released on May 14 showed, and that pain was highly concentrated among low earners. Fully 39 percent of former workers living in a household earning $40,000 or less lost work, compared with 13 percent in those making more than $100,000, a Fed official said.

    • Is ‘Covid toe’ a symptom of the disease?

      There is an uptick in people reporting symptoms of chilblains, which are painful red or purple lesions that typically appear in the winter on fingers or toes. The lesions are emerging as yet another symptom of infection with the new coronavirus. Chilblains are caused by inflammation in small blood vessels in reaction to cold or damp conditions, but they are usually common in the coldest winter months. Federal health officials do not include toe lesions in the list of coronavirus symptoms, but some dermatologists are pushing for a change, saying so-called Covid toe should be sufficient grounds for testing.

    • Should I wear a mask?

      The C.D.C. has recommended that all Americans wear cloth masks if they go out in public. This is a shift in federal guidance reflecting new concerns that the coronavirus is being spread by infected people who have no symptoms. Until now, the C.D.C., like the W.H.O., has advised that ordinary people don’t need to wear masks unless they are sick and coughing. Part of the reason was to preserve medical-grade masks for health care workers who desperately need them at a time when they are in continuously short supply. Masks don’t replace hand washing and social distancing.

    • What should I do if I feel sick?

      If you’ve been exposed to the coronavirus or think you have, and have a fever or symptoms like a cough or difficulty breathing, call a doctor. They should give you advice on whether you should be tested, how to get tested, and how to seek medical treatment without potentially infecting or exposing others.

    • How can I help?

      Charity Navigator, which evaluates charities using a numbers-based system, has a running list of nonprofits working in communities affected by the outbreak. You can give blood through the American Red Cross, and World Central Kitchen has stepped in to distribute meals in major cities.


Smallpox was our familiar; it infected only humans. That was, in the end, what made it possible to dream of eradicating the disease, by vaccinating the world, by tracking down every last case. And the eradication of smallpox (the last natural case was in 1977) stands as the kind of human achievement — multinational, data-based, reaching all levels of society — that we need our scientists and our governments to replicate now.

Because we are living through a pandemic, we find ourselves hoping now for a vaccine which will, in some sense, give us back the world, or at least, a sense of safety as we move about it; protect our grandparents, allow our students to learn and live in groups, and offer us ways back to the many plans — for work and for play — which are currently shadowed, or on hold altogether.

Vaccination is named for that cowpox virus which successfully tricks the immune system, setting off that complicated powerful protective reaction without requiring exposure to the real danger. That’s what vaccines do, though vaccine science has come a long way since then; current approaches to a coronavirus vaccine would not include a live unaltered virus, like the one that Jenner used, but would rely on inactivated or weakened virus, or segments of viral genes.

To get to the vaccine we’re hoping for now — if we’re lucky — will involve a great deal of very smart science, and the participation of many animal subjects, from mice to monkeys, followed by a cohort of human volunteer subjects, to grant consent and be cared for according to our modern ethical framework, even if we do set up special pandemic parameters. It’s an appropriate moment to remember Edward Jenner, James Phipps, Sarah Nelmes and even Blossom the cow.

Dr. Perri Klass is the author of the forthcoming book “A Good Time to Be Born: How Science and Public Health Gave Children a Future,” on how our world has been transformed by the radical decline of infant and child mortality.

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