97 Fun Facts About Public Health

John Snow traced the 1854 Soho cholera outbreak to a public water pump on which street?

Broad Street's brewery workers were spared: they drank their beer allowance instead of pump water, one of the oddities that pointed Snow to the well.

Which explanation of disease did John Snow's cholera work help discredit?

Miasma theory blamed cholera on foul air rising from rotting matter; Snow argued instead that it was swallowed in water tainted by sewage, and his map of deaths around one pump made the case.

Ignaz Semmelweis cut childbed fever deaths in 1847 by having doctors wash their hands in what?

Chlorinated lime solution cut deaths on his ward from about 18% to under 2% within months; he had realised that students were carrying infection on their hands straight from the dissecting room.

The 'Semmelweis reflex' describes what?

Rejecting new evidence that contradicts established beliefs is named for Ignaz Semmelweis, whose proof that handwashing saved mothers' lives was dismissed by the leading doctors of his day.

In 1796 Jenner inoculated James Phipps with material from which disease to protect against smallpox?

Cowpox matter came from blisters on the hand of dairymaid Sarah Nelmes; the Latin vaccinus, 'of a cow', is why such jabs have been called vaccines ever since.

In which year did the WHO certify smallpox eradicated, the only human disease ever wiped out?

The last natural case was Somali cook Ali Maow Maalin in 1977; the disease had killed around 300 million people in the 20th century.

Official stocks of live smallpox virus are held only at the CDC in Atlanta and a lab in which country?

Russia's Vector Institute holds the other stock; after eradication every other laboratory had to destroy its samples or hand them over to one of the two.

Robert Koch's postulates, formulated in 1884, are criteria for establishing what?

That a microbe causes a specific disease takes four tests, but the first, that the germ is never found in healthy people, proved too strict: Koch himself met symptom-free carriers of cholera.

Which kind of chart, nicknamed the 'coxcomb', did Nightingale use to show Crimean War deaths?

Polar area diagram wedges each stood for a month, their area showing how many soldiers died; the picture made plain that preventable disease, not wounds, was the army's great killer.

'Typhoid Mary' Mallon, a healthy carrier who infected household after household with typhoid, worked in what job?

Cook Mary Mallon was freed in 1910 on condition that she never handle food again; by 1915 she was cooking at a maternity hospital under a false name, and she was confined for the rest of her life.

Why was the influenza of 1918 nicknamed the 'Spanish flu'?

Neutral Spain's uncensored press reported it freely, even when King Alfonso XIII fell ill, while the nations at war censored news of their own outbreaks to protect morale.

Which 1918 event in Philadelphia became a notorious super-spreader, followed by about 12,000 deaths?

A Liberty Loans parade packed some 200,000 people together after the city's health director let it go ahead; within 72 hours every bed in Philadelphia's 31 hospitals was full.

The 1954 trial that enrolled more than a million children as 'Polio Pioneers' tested which scientist's injected vaccine?

Jonas Salk never patented it or earned money from it; asked on television who owned the vaccine, he said the people did, adding, 'Could you patent the sun?'

Which charity paid for the polio vaccine research and promoted the mass immunisation drive of the 1950s?

The March of Dimes grew out of the foundation that Franklin Roosevelt, himself diagnosed with polio in 1921, created in 1938; its small-change appeals raised the money for the vaccine research.

Which US city began the first controlled water-fluoridation experiment on 25 January 1945?

Grand Rapids, Michigan was paired with untreated Muskegon nearby; within 11 years tooth decay among its children had fallen by more than 60 percent.

Dentist Frederick McKay traced the 'Colorado brown stain' on residents' teeth to what cause?

Drinking water in the region was naturally rich in fluoride, which mottled the enamel brown yet left those teeth surprisingly resistant to decay, the clue that led to fluoridation.

The CDC was founded in 1946 primarily to fight which disease in the American South?

Malaria was still endemic in the South, which is why the agency was based in Atlanta; it started with fewer than 400 staff and trucks, sprayers and shovels for a war on mosquitoes.

Which pesticide, a wartime weapon against disease-carrying insects, was banned from US farms in 1972 after the book Silent Spring?

DDT won Paul Müller the 1948 Nobel Prize in medicine for finding its power to kill the insects that spread disease; 24 years later the US withdrew it over the harm to wildlife.

The World Health Organization was founded on 7 April of which year, a date now marked as World Health Day?

Its headquarters are in Geneva and its first director-general was Canadian psychiatrist Brock Chisholm.

The 1978 Alma-Ata Declaration named what as the key to achieving 'Health for All' by the year 2000?

Primary health care, basic services close to where people live, drew part of its inspiration from China's 'barefoot doctors', villagers given basic medical training to treat their neighbours.

Six weeks after declaring COVID-19 a global health emergency, the WHO first described it on 11 March 2020 with which word?

Pandemic was a word WHO chief Tedros Adhanom Ghebreyesus said should not be used lightly; he chose it on 11 March, citing 'alarming levels of spread and severity' and of inaction.

The Framingham Heart Study, begun in 1948, is credited with coining which everyday medical term?

Risk factor is a term the study gave medicine as it showed that high blood pressure and cholesterol predict heart disease; it now follows the grandchildren of its original 1948 volunteers.

In the Tuskegee study of 1932 to 1972, US health officials left hundreds of Black men untreated for which disease?

Syphilis went untreated even after penicillin became the treatment of choice in the 1940s; the study stopped only when a 1972 Associated Press story caused a public outcry.

Which whistleblower leaked the Tuskegee study to the Associated Press in 1972?

Peter Buxtun, a Public Health Service employee, had protested inside the agency since 1966 and been turned down twice before he took the story to a reporter.

After the Surgeon General's 1964 smoking report, Congress required what on every cigarette pack?

A health warning, 'Caution: Cigarette Smoking May Be Hazardous to Your Health', was required by a 1965 law; a second law then took cigarette advertising off American television and radio.

Why was the 1964 Surgeon General's smoking report released on a Saturday?

To limit its effect on the stock market, and to catch the Sunday papers, the report came out on a Saturday; it drew on more than 7,000 scientific articles and was front-page news across the country.

In epidemiology, what does R0 (the basic reproduction number) measure?

New cases caused by each case, in a population where nobody is yet immune: above 1 an outbreak grows, below 1 it dies out.

Which disease is so contagious that roughly 95% of a community must be immune to stop it spreading?

Measles virus stays infectious in the air for up to two hours after a cough or sneeze, and a single case can infect up to 18 other people.

Which research design follows disease-free people forward in time according to their exposure?

Cohort studies borrow the name of a Roman army unit of a few hundred soldiers: a group enrolled together and followed as it marches forward through time.

The word 'epidemiology' comes from Greek roots meaning the study of what?

What is upon the people: epi (upon), demos (people) and logos (study); the Greek word epidemia first meant a stay in a place, then the sickness that came to stay.

Which US state was first to require seat-belt use, from 1 December 1984?

New York's law proved contagious: belt use had been voluntary everywhere, yet by the end of 1995 every other state but one had an adult belt law of its own.

As of 2025, which US state is the only one with no seat-belt law for adults?

New Hampshire, the state whose motto is 'Live Free or Die', is the lone holdout: every other state and Washington DC require at least adults in the front seats to buckle up.

Oral rehydration therapy for cholera and diarrhoea combines water with sugar and what?

Salts and sugar together let the gut absorb water; in 1971 refugee camps where intravenous drips had run out, the mix held cholera deaths to 3.6%, against about 30% before.

Which 1906 novel about Chicago's meatpacking plants prompted the Pure Food and Drug Act?

The Jungle was written to expose the misery of immigrant workers, but readers fixed on the filthy meat; Upton Sinclair said he had aimed at the public's heart and by accident hit it in the stomach.

Walter Reed's army commission in Cuba showed around 1900 that mosquitoes spread which deadly disease?

Yellow fever had been pinned on mosquitoes by Cuban doctor Carlos Finlay in 1881, but he could not prove it; Reed's team did, using human volunteers, and lost one of its own doctors to the disease.

Which toxic metal was added to petrol for decades before the United States began phasing it out in the 1970s?

Lead went into petrol from the 1920s because a General Motors engineer found it stopped engines knocking; US sales of leaded fuel for road vehicles ended only at the start of 1996.

The APHA's annual national awareness observance in the US falls during which part of the year?

The APHA organises it; the CDC credits public health measures with about 25 of the years added to US life expectancy in the 20th century.

Which of these did the CDC name among the ten great public health achievements of the 20th century?

Motor-vehicle safety made the list because deaths per mile driven fell by 90% between 1925 and 1997, even as Americans drove ten times as far.

Whose 1920 definition calls public health 'the science and art of preventing disease, prolonging life'?

Winslow was a Yale bacteriologist and the definition is still quoted in textbooks.

Which vitamin has been added to American milk since the 1930s to protect children against rickets?

Vitamin D is made in the skin by sunlight, so children who saw little sun were the ones whose bones went soft; adding it to milk helped make rickets rare in the United States.

Unlike most flu outbreaks, the influenza of 1918 was unusually deadly for which age group?

Young adults in their twenties and thirties died at rates rarely seen in flu; one theory is that their strong immune systems overreacted to the virus and ravaged their own lungs.

Whose 1842 report on the sanitary condition of the labouring population led to England's 1848 Public Health Act?

Edwin Chadwick was a lawyer, not a doctor, who came to sanitation as secretary to the Poor Law commissioners; the Act his report inspired set up a General Board of Health, with Chadwick as one of its three members.

Which English port, crowded with Irish famine refugees, appointed Britain's first medical officer of health in 1847?

Liverpool gave the post to Dr William Duncan, who had shown that more of its people lived in cellars than in any other town; it also hired Britain's first borough engineer, James Newlands, to build sewers.

Which engineer built London's sewer network after the Great Stink of 1858?

Joseph Bazalgette got the go-ahead after a hot summer when the sewage-filled Thames reeked so badly beside Parliament that MPs, after years of argument, passed a law to fund his sewers.

In James Lind's 1747 trial aboard HMS Salisbury, which daily ration cured sailors of scurvy within a week?

Two oranges and a lemon a day had one sailor fit for duty in six days, yet the Royal Navy took until 1795, nearly half a century later, to make citrus juice a standard issue.

Which university opened its School of Hygiene and Public Health in 1916 with Rockefeller Foundation backing?

Johns Hopkins University owed the school to pathologist William Welch, whose 1915 report for the Rockefeller Foundation set out the plan; Harvard and Columbia had copied the model by 1922.

A $25,000 gift from which banana magnate founded Tulane's public health school in 1912?

Tulane's School of Public Health and Tropical Medicine conferred its first doctor of public health degree in 1914.

Which rock and roll star was vaccinated against polio backstage at The Ed Sullivan Show in 1956?

Elvis Presley rolled up his sleeve for the press because fewer than one American teenager in a hundred had been immunised, and health officials hoped his fans would copy him.

Which carmaker introduced the three-point seat belt in 1959 and let rivals use the patent for free?

Volvo engineer Nils Bohlin designed the belt, and the company opened the patent to every manufacturer in the interest of safety. He later proved its worth with a study of 28,000 Swedish accidents.

Which former US president's foundation has led the drive to wipe out Guinea worm disease since 1986?

Jimmy Carter's centre took on a parasite that infected an estimated 3.5 million people a year and pushed it to the brink of extinction.

The word quarantine comes from a wait imposed on ships during plague outbreaks by which Italian republic?

Venice made crews sit at anchor before anyone could land, stretching a thirty-day rule that the port of Ragusa, modern Dubrovnik, had tried first in 1377.

Which sedative, blocked in the US by reviewer Frances Kelsey, caused thousands of birth defects in Europe?

Thalidomide never reached American pharmacies because Kelsey doubted the evidence that it was safe, and President Kennedy honoured her for it in 1962.

Which colour of ribbon did a group of artists launch in 1991 as the symbol of AIDS awareness?

Red ribbons came from the Visual AIDS Artists Caucus, and actor Jeremy Irons made them famous by wearing one on stage at that year's Tony Awards.

William Gorgas's war on yellow fever mosquitoes let the United States complete which engineering landmark?

The Panama Canal became buildable once Gorgas drained and screened standing water, the same approach that had cut Havana's cases from 784 to zero within a year.

Which illness was first identified after pneumonia struck veterans at a 1976 hotel convention in Philadelphia?

Legionnaires' disease killed 29 of the 182 people who fell ill, and the bacterium was later found breeding in the cooling tower of the hotel's air conditioning.

Which food giant faced a boycott from 1977 over its marketing of infant formula in poorer countries?

Nestlé was accused of promoting formula as a substitute for breast milk. The boycott began in the United States on 4 July 1977 and later spread to Europe.

Which medical journal retracted Andrew Wakefield's 1998 paper that falsely linked the MMR vaccine to autism?

The Lancet withdrew the paper in 2010, after a newspaper investigation exposed it as fraudulent, and Wakefield was struck off the medical register three months later.

The World Health Organization has its headquarters in which Swiss city, home to a major United Nations office?

Geneva is where the agency's headquarters building, designed by Jean Tschumi, opened in 1966, directing six regional offices and 150 field offices around the world.

Which parasites, living on the black rats aboard trading ships, carried the plague during the Black Death?

Fleas passed on the bacterium Yersinia pestis with their bites, and most likely reached Europe on Genoese ships sailing from Crimea.

Which disease led Hawaii to exile about 8,500 people to Molokai's Kalaupapa peninsula between 1866 and 1969?

Leprosy, also called Hansen's disease, is curable with multidrug therapy, and patients stop being infectious after the first monthly dose.

The HPV vaccine, first sold in 2006 under the name Gardasil, chiefly prevents cancer of which body part?

Cervix tumours are caused in about 70% of cases by HPV types 16 and 18, the two strains that every version of the vaccine protects against.

Lyme disease is named after a town in which US state, the site of a 1975 cluster of childhood arthritis?

Connecticut physicians first mistook the cluster, spread across three towns including Lyme and Old Lyme, for juvenile rheumatoid arthritis.

Which UN agency, created in 1946 to feed and clothe children displaced by war, won the 1965 Nobel Peace Prize?

UNICEF kept its acronym even after the words International and Emergency were dropped from its name in 1953, when the temporary relief fund became permanent.

Which consumer advocate's 1965 book Unsafe at Any Speed pushed Congress to set federal car-safety standards?

Ralph Nader was a 31-year-old attorney when the book came out, and within a year Congress had passed the National Traffic and Motor Vehicle Safety Act.

Which nurse opened America's first birth control clinic in 1916 and later founded Planned Parenthood?

Margaret Sanger was arrested nine days after the clinic opened, for handing a pamphlet to an undercover policewoman, and it closed for good within a month.

Which drug, discovered by Alexander Fleming in 1928, was mass-produced in time for the Normandy landings?

Penicillin was once so scarce that hospitals collected patients' urine to recover and reuse it, yet American plants had 2.3 million doses ready for the invasion in 1944.

Christmas Seals, the charity stamps first sold in America in 1907, raised money to fight which disease?

Tuberculosis was then treated by confining patients in sanatoriums, and Emily Bissell designed the first stamp to find the $300 that would keep a Delaware one open.

Which overdose antidote, sold as the nasal spray Narcan, do US pharmacies supply without a prescription?

Naloxone starts working within two minutes when given into a vein and about ten as a nasal spray, which is why it is packed into emergency overdose kits.

Which family owned Purdue Pharma, the OxyContin maker blamed for a central role in the US opioid epidemic?

The Sacklers saw Purdue launch OxyContin in 1996 as a slow-release form of oxycodone, a painkiller first synthesised back in 1916, and promote it heavily.

A 1994 US campaign telling parents to lay babies on their backs to sleep targeted which cause of infant death?

SIDS, sudden infant death syndrome, has fallen by more than half since the campaign began, as far fewer babies were put down on their stomachs.

Which term describes a disease like chickenpox in Britain, constantly present at a steady, predictable level?

Endemic says nothing about severity: the steady number of cases can be high or low and the illness mild or serious, so long as it varies little from year to year.

Which US president launched PEPFAR, the largest commitment by any nation to fighting a single disease?

George W. Bush launched the HIV/AIDS plan in 2003 after the House backed it by 375 votes to 41, and by 2024 it had put $120 billion into treatment and prevention.

What nickname did China give farmers with basic medical training who treated their fellow villagers?

Barefoot doctors took their name from southern farmers who worked shoeless in the rice paddies, and the scheme went on to inspire the WHO's 1978 Alma-Ata conference.

Which scientist developed the oral polio vaccine of the 1960s, given to children as drops on a sugar cube?

Albert Sabin used weakened live viruses rather than killed ones, and the sugar was there to mask the bitter taste of the drops.

The Ebola virus was named in 1976 after a river in which African country, where the virus was first identified?

DR Congo, then called Zaire, was spared a stigmatised town: virologist Karl Johnson chose the Ebola, a headstream 111 km away, so that Yambuku would not carry the name.

A lack of which nutrient is the leading cause of preventable childhood blindness around the world?

Vitamin A deficiency has blinded an estimated 250,000 to 500,000 malnourished children a year, and about half of them die within twelve months of losing their sight.

Which livestock disease became, in 2011, only the second disease in history declared eradicated worldwide?

Rinderpest is the closest relative of the measles virus, which may have branched off from it once human settlements grew large enough to keep an infection circulating.

A hospital worker in which African country caught the world's last natural case of smallpox in 1977?

Somalia's Ali Maow Maalin is thought to have been infected during a journey of no more than 15 minutes; he recovered and later joined the campaign to wipe out polio.

US flour and cereal grains have been fortified since 1998 with which nutrient to prevent spina bifida?

Folic acid has been added to food in more than 80 countries, and mandatory national programmes are linked to about 30% fewer births with spina bifida.

Which Welsh coal miner's son created Britain's National Health Service as Clement Attlee's Minister of Health?

Aneurin Bevan worked as a miner in his teens and took his model from the Tredegar Medical Aid Society in his home town, making treatment free at the point of need.

The US Public Health Service traces its origins to a 1798 law funding hospitals for which group of workers?

Merchant seamen paid for it themselves: the act signed by President Adams took twenty cents a month from each sailor's wages to fund marine hospitals.

Which US research agency began in 1887 as the Hygienic Laboratory, a bacteria lab on Staten Island?

The NIH kept the Hygienic Laboratory name until 1930, when the Ransdell Act renamed it and granted $750,000 for two new buildings.

The CDC founded its Epidemic Intelligence Service amid fears of biological warfare during which conflict?

The Korean War gave Alexander Langmuir his argument: field officers trained to recognise germ attacks could also chase outbreaks beyond the reach of state health departments.

The first official report of what became AIDS, in June 1981, described five men with pneumonia in which city?

Los Angeles supplied the cluster of five Pneumocystis pneumonia cases that the CDC printed in its Morbidity and Mortality Weekly Report on 5 June.

Which Indiana teenager, barred from school after an AIDS diagnosis, gave his name to a major 1990 federal law?

Ryan White was a haemophiliac infected through a contaminated blood treatment and given six months to live in 1984; he survived for more than five years.

Which Surgeon General, known for his beard and uniform, mailed AIDS advice to every US household in 1988?

C. Everett Koop wrote the official US policy on the disease himself, and the Associated Press later called him the only holder of the office to become a household name.

Which strategy, immunising only the people around each new case, helped finish off smallpox in the 1970s?

Ring vaccination builds a wall of immune people around an outbreak, covering each patient's contacts and then the contacts of those contacts, such as family, neighbours and friends.

Lady Mary Wortley Montagu brought smallpox inoculation to Britain after seeing it practised in which empire?

Ottoman practice won her over, the disease having killed her brother and scarred her own face: she had her son inoculated at the embassy and later her daughter in England.

Which Canadian city gave its name to the 1986 WHO charter that set out the principles of health promotion?

Ottawa hosted the First International Conference on Health Promotion in November 1986, and the charter signed there launched action by governments and local communities alike.

The Whitehall studies, which tied lower job rank to higher death rates, followed which group of British workers?

Civil servants in the lowest grade, such as messengers and doorkeepers, died at three times the rate of the administrators at the top.

Merck has given away the drug ivermectin since 1987 to fight which parasitic disease spread by black flies?

River blindness is so called because the black flies that spread the worm live near rivers, and the free drug is handed out in mass treatment programmes as Mectizan.

The Rockefeller Sanitary Commission of 1909 set out to rid 11 Southern US states of which intestinal parasite?

Hookworm was known as the germ of laziness, and the five-year campaign of testing and treatment was paid for with a $1 million gift from the oil tycoon.

Which Merck scientist developed over 40 vaccines, including a mumps shot grown from his own daughter's infection?

Maurice Hilleman's team produced eight of the vaccines routinely recommended for American children, and the mumps strain is named Jeryl Lynn after his daughter.

Which German pathologist, sent to study an 1848 typhus epidemic in Upper Silesia, declared medicine a social science?

Rudolf Virchow did little to halt the outbreak itself, yet his 190-page report on it became a turning point in German politics and medicine.

Which nurse founded the Henry Street Settlement and coined the term 'public health nurse' for community work?

Lillian Wald had quit medical school by 1893 to teach home nursing to poor immigrant families, and went on to campaign for nurses in public schools.

The Guthrie heel-prick test was devised in 1962 to screen newborns for which metabolic disorder?

Phenylketonuria can impair brain development if it goes unnoticed, which is why a few drops of blood from a baby's heel became a core screening test by the late 1960s.

Joseph Goldberger showed that pellagra, epidemic in the American South, came from poor diets built on which staple?

Corn-based meals with no meat, milk or vegetables were what he fed 11 healthy prison volunteers, in exchange for pardons, to show that the illness was not infectious.