Keep calm, carry on, and maybe wash your hands a little more often – that’s the classic public‑health mantra when a deadly epidemic looms. The advice boils down to: panic less, pandemic less. Yet while the rest of us are busy sanitising surfaces, a legion of epidemiologists is sprinting against the clock, tracing each outbreak back to its origin point, hoping to pin down the elusive patient zero.
Think of an epidemic as a geological quake: it has a clear epicentre, a single spot where the tremor begins. In disease terms that spot is a person, the infamous “patient zero.” Below you’ll meet the ten most notorious first‑infected individuals whose stories have shaped our understanding of contagion.
10 People Who Changed the Course of Global Health
10 Typhoid Mary
We kick off with the most celebrated patient zero of all time, the woman dubbed “Typhoid Mary,” whose birth name was Mary Mallon. At the tender age of fifteen she left Ireland for the United States in 1884, eventually finding work as a domestic servant.
By 1906 Mary had risen to the role of cook for the affluent Warren family, who spent their summers in Oyster Bay, Long Island. While her culinary creations never raised eyebrows, a strange pattern emerged: everyone she cooked for seemed to fall seriously ill.
Of the eight families Mary served before the Warrens, seven experienced confirmed cases of typhoid fever. Though she carried the bacterium, she never suffered symptoms herself and staunchly refused quarantine. In 1907 New York found itself at the centre of a typhoid outbreak that affected roughly 3,000 people, and Mary was blamed as the outbreak’s patient zero.
Following two years of forced confinement on North Brother Island, Mary was released only to take a job – under an alias – as a cook in a maternity hospital. When another wave of typhoid erupted, authorities permanently detained her on Pest Island in the East River, where she remained until her death on November 11, 1938. Her obituary listed her as the cause of 51 typhoid cases and three deaths.
9 Frances Lewis
Cholera posed a grave menace to Victorian London. In just ten days of 1854, half a thousand souls perished within a few blocks of the city centre. The disease manifested as vomiting, diarrhoea, severe cramps and an unquenchable thirst – a patient could die within hours of feeling queasy.
When the epidemic finally subsided, over 10,000 bodies lay in mass graves, and scientists scrambled to pinpoint the source. Their investigation led them to a tiny five‑month‑old infant named Frances Lewis – the unsuspected ground zero.
Local physician John Snow charted each death on a map, producing the now‑famous “ghost map.” It revealed that the majority of victims lived near a water pump on Broad Street. Frances’ mother, attempting to clean her baby’s soiled diapers, poured the contaminated water into a cesspool directly outside their home. That cesspool leaked into the public water supply, poisoning thousands. Once the pump was decommissioned, the cholera outbreak quickly fizzled.
8 Mabalo Lokela
Ebola stands among the most terrifying diseases of the 21st century, causing victims to bleed internally to death. Even today, there is no universally approved cure or vaccine, and the virus’s recurring nature remains a puzzle.
The first recorded Ebola victim was a teacher named Mabalo Lokela from Yambuku, in the Democratic Republic of Congo. After returning from a northern trip in August 1976, he developed a high fever. Initially misdiagnosed as malaria, his condition worsened over two weeks with relentless vomiting, breathing trouble, and bleeding from the eyes, nose, and mouth, ultimately leading to his death.
Tragically, the virus survived him. Those who tended to Mabalo during his illness contracted Ebola, and the infection ravaged his village – about 90 % of its inhabitants perished. The world watched in horror as epidemiologists raced to contain the outbreak.
The most catastrophic Ebola episode occurred in 2014, claiming over 5,000 lives in a single year. By the end of the outbreak in June 2016, more than 11,000 people had died – five times the total of all prior Ebola crises. That West African epidemic traced back to a two‑year‑old boy, Emile Ouamouno, whose death sparked a chain of infections throughout his remote Guinean village.
7 Dr Liu Jianlin
Over nine months, Severe Acute Respiratory Syndrome (SARS) crept across the globe, claiming 774 lives in 37 countries and leaving countless others seriously ill. First identified in Guangdong, China, in November 2002, it was initially described as “atypical pneumonia.”
As the virus spread, little was known about its nature until Dr Liu Jianlin, a physician from Guangdong, checked into Hong Kong’s Metropole Hotel. He turned out to be hyper‑infectious, spreading the disease to roughly twelve fellow guests before succumbing to respiratory failure.
One of those twelve was Sui‑Chu Kwan, a resident of Scarborough, Ontario, who boarded a flight to Canada just two days after her encounter with Dr Liu, inadvertently carrying the virus across the Atlantic.
6 Edgar Enrique Hernandez
“Kid Zero” sounds like a comic‑book sidekick, yet it was the nickname given to the first human infected with the H1N1 swine‑flu virus. Four‑year‑old Edgar Enrique Hernandez from La Gloria, Mexico, tested positive in March 2009, his smiling face splashed across newspaper front pages worldwide.
In his hometown, several hundred residents fell ill within weeks, and two children died. The World Health Organization estimates that, as of January 2016, H1N1 had directly or indirectly caused over 18,000 deaths, though the CDC suggests the global toll could range between 150,000 and 575,000.
Many locals blame nearby industrial hog farms for the outbreak, but the exact origin remains debated. Whether Edgar was truly the first human case is still unconfirmed. Nevertheless, La Gloria erected a bronze statue of him, hoping to turn the town’s grim claim to fame into a tourist attraction.
5 Patient Zero MERS
The Middle East Respiratory Syndrome (MERS) outbreak in South Korea was declared over in July 2015. Known colloquially as “camel flu,” the disease first surfaced in Saudi Arabia and is thought to have originated from bats.
While the first Saudi victim remains anonymous, the South Korean epidemic could be traced to a single individual. This patient first sought help on May 11, 2015, for a persistent cough and fever at a clinic in Asan, south of Seoul. After four days of baffling examinations, he finally visited Samsung Medical Center on May 20, revealing recent travel to Saudi Arabia and the United Arab Emirates, where he was diagnosed with MERS.
By then, he had already infected two roommates, his doctor, several ward‑mates, and their visiting relatives. In total, South Korea recorded 186 confirmed cases, prompting massive quarantines that threw Seoul into chaos.
4 Gaetan Dugas
The most infamous name on this roster belongs to Gaetan Dugas, an Air Canada flight attendant who, in the late 1970s, was identified by scientists as the initial carrier who introduced HIV/AIDS to the United States.
Journalist Randy Shilts publicly named Dugas in his 1987 bestseller And The Band Played On. The New York Post ran the headline “The Man Who Gave Us AIDS,” cementing Dugas’s reputation as the disease’s notorious patient zero.
Subsequent genetic research, however, has cast doubt on that claim. A 2016 study analysing blood samples from the late 1970s concluded that HIV likely entered New York City around 1970, spreading from Caribbean nations such as Haiti, making Dugas’s role far less pivotal than once thought.
As of February 2020, roughly 30 million people worldwide have died from AIDS‑related illnesses, though the virus itself is rarely the direct cause of death; it weakens the immune system, allowing other conditions to become fatal.
3 Patient Zero SARS‑Cov‑2
By December 2019, the first cases of the novel coronavirus SARS‑CoV‑2, later dubbed COVID‑19, surfaced in China. While the virus likely originated in a Wuhan wet market, its exact patient zero remains shrouded in mystery.
Chinese authorities point to a 55‑year‑old man from Hubei province as the initial case. In late 2019, whispers of a strange flu circulated on the WeChat platform, with users posting about coughs, shortness of breath, and references to “SARS.” By early December, a pneumonia of unknown origin was identified among market workers and patrons.
Most infected individuals experience mild or no symptoms, but some develop severe respiratory distress, requiring intensive care and ventilation. The virus’s long‑term physical and psychological impacts are still under investigation. By May 2021, more than 150 million cases and over three million deaths had been recorded worldwide.
2 Private Albert Gitchell
When you think of the world’s deadliest pandemics, the Spanish flu inevitably springs to mind, claiming an estimated 20‑40 million lives. The outbreak began in March 1918, amid the chaos of World War I.
It all started on Monday, March 11, 1918, with a single cough – the cough of Private Albert Gitchell, a cook stationed at Fort Riley, Kansas. Military medics, aware of how quickly disease spreads in cramped barracks, promptly placed Gitchell under quarantine, but the damage was already done.
Having prepared dinner for hundreds of soldiers the night before, Gitchell’s infection rapidly manifested: by midday, over a hundred troops fell ill, and nearly half of those succumbed. The virus then surged across the United States and Europe, leaping over enemy lines and reshaping the course of the 20th century.
1 Goodwoman Phillips
Goodwoman Phillips was not the inaugural victim of the bubonic plague, nor its final one. Yet she holds the grim distinction of being the first recorded death from plague during London’s Great Plague of 1665‑66.
London draper and early statistician John Graunt meticulously logged plague fatalities, noting that Goodwoman’s death marked the epidemic’s official start. In total, more than 68 000 Londoners perished out of a population of roughly 450 000 – a mortality rate exceeding 15 %.
Contemporary folklore blamed two ominous signs: a comet streaking across the sky and the coronation of King Charles II. These events were interpreted as bad omens, suggesting divine displeasure. Modern science, however, attributes the outbreak to squalid living conditions that fostered rat‑borne fleas carrying Yersinia pestis, the bacterium responsible for plague.
Today, plague still surfaces sporadically, but antibiotics render it far less lethal than in the 17th century. Between 2000 and 2010, 21 725 cases were reported worldwide, resulting in 1 612 deaths – a stark reminder that history’s deadliest diseases can persist, albeit in a much tamer form.