[7][19], ACAM2000 is a smallpox vaccine developed by Acambis. The smallpox vaccine, introduced by Edward Jenner in 1796, was the first successful vaccine to be developed. Vaccines that only contain attenuated vaccinia viruses (an attenuated virus is one in which the pathogenicity has been decreased through serial passage) have been proposed, but some researchers[who?] [81] He later reported that glycerine killed the causative organisms of erysipelas and tuberculosis when they were added to the vaccine in "considerable quantity", and that his method was widely used on the continent. [88], In a letter about landmarks in the history of smallpox vaccine, written to and quoted from by Derrick Baxby, Donald Henderson, chief of the Smallpox Eradication Unit from 1967–77 wrote; "Copeman and Collier made an enormous contribution for which neither, in my opinion ever received due credit". He returned to Spain in 1806. [medical citation needed], The Jynneos smallpox and monkeypox live, non-replicating vaccine[17] was approved by the U.S. Food and Drug Administration (FDA) in September 2019. [78], In the late 1940s and early 1950s, Leslie Collier, an English microbiologist working at the Lister Institute of Preventive Medicine, developed a method for producing a heat-stable freeze-dried vaccine in powdered form. Some of the earliest statistical and epidemiological studies were performed by James Jurin in 1727 and Daniel Bernoulli in 1766. [96] Edward Jenner had obtained his vaccine from the cow, so he named the virus vaccinia, after the Latin word for cow. [62][63], In 1804 the Balmis Expedition, an official Spanish mission commanded by Francisco Javier de Balmis, sailed to spread the vaccine throughout the Spanish Empire, first to the Canary Islands and on to Spanish Central America. [2] Those closely involved in the campaign were awarded the "Order of the Bifurcated Needle". An account from letter by Lady Mary Wortley Montagu to Sarah Chiswell, dated 1 April 1717, from the Turkish Embassy describes this treatment: The small-pox so fatal and so general amongst us is here entirely harmless by the invention of ingrafting (which is the term they give it). Trace amounts of the following antibiotics (added during processing) may be present: neomycin sulfate, chlortetracycline hydrochloride, polymyxin B sulfate, and dihydrostreptomycin sulfate. Coronavirus disease outbreak (COVID-2019), Coronavirus disease outbreak (COVID-19) », Meeting of the Strategic Advisory Group of Experts on immunization, conclusions and recommendations, Global Advisory Committee on Vaccine Safety, Smallpox vaccine: The Good, the Bad, and the Ugly, Recommendations for the production and quality control of smallpox vaccines, TRS 926, Best practices in vaccine production for smallpox and other potential pathogens. At the same time the 1898 Vaccination Act banned arm-to-arm vaccination, thus preventing transmission of syphilis by this vaccine. He thought vaccination offered no advantage over variolation, but maintained friendly contact with Jenner and certainly made no claim of priority for vaccination when critics attacked Jenner's reputation. Jenner took the opportunity to test his theory. From 1770 to 1772 Jenner received advanced training in London at St Georges Hospital and as the private pupil of John Hunter, then returned to set up practice in Berkeley. The term vaccine derives from the Latin word for cow, reflecting the origins of smallpox vaccination. After two years of intensive searches, what proved to be the last endemic case anywhere in the world occurred in Somalia, in October 1977. [55] Unfortunately glycerolated vaccine soon lost its potency at ambient temperatures which restricted its use in tropical climates. [54] Vaccination, the term which soon replaced cowpox inoculation and vaccine inoculation, was first used in print by Jenner's friend, Richard Dunning in 1800. Vaccine issued by the Government Vaccine Establishment contained 5,000 bacteria per gram, while commercial vaccines contained up to 100,000 per gram. In 1972, routine smallpox immunization was discontinued in the United States, and since 1983, vaccine production has been halted. [8], The vaccine is effective, providing successful immunogenicity in about 95% of vaccinated persons. [100] Others believed that smallpox and vaccinia shared a common ancestor. According to the Centers for Disease Control and Prevention (CDC), "vaccination within 3 days of exposure will prevent or significantly lessen the severity of smallpox symptoms in the vast majority of people. In 2003 this supply helped contain an outbreak of monkeypox in the United States. The first smallpox immunization was created by Edward Jenner in 1796. Known as variolation or inoculation, the method was developed to prevent smallpox — a destructive disease that frequently plagued Europe and Asia in the Middle Ages. Out of 20 cowpox strains that have been sequenced, the cowpox strains found in Great Britain are the least related to vaccinia. In the 20th century, the smallpox vaccine was identified as a separate viral species known as vaccinia, which was serologically distinct from cowpox. Vaccines containing vaccinia viruses were used effectively in the campaign to eradicate smallpox. Although theoretically still compulsory, the 1907 Act effectively marked the end of compulsory infant vaccination in England. [3][6] As of August 2014[update], 24 million doses of Imvamune were delivered to the U.S. Strategic National Stockpile (SNS) for use by people with weakened immune systems or atopic dermatitis. Reviews of his rejected report, published for the first time in 1999, were skeptical and called for further vaccinations. Through the widespread administration of the smallpox vaccine, doctors declared the smallpox virus “extinct” in the United States in 1952. Rather, it begins with the long history of infectious disease in humans, and in particular, with early uses of smallpox material to … The practice had been known in Boston since 1706, when Cotton Mather (of Salem witch trial fame) discovered his slave, Onesimus had been inoculated while still in Africa, and many slaves kidnapped in Africa and brought to Boston had also received inoculations. [78] During this period there were no adequate methods for assessing the safety of the vaccine and there were instances of contaminated vaccine transmitting infections such as erysipelas, tetanus, septicaemia and tuberculosis. Of those who contracted the disease at the time, about 30… [citation needed], Louis T. Wright,[75] an African-American Harvard Medical School graduate (1915), introduced intradermal vaccination for smallpox for the soldiers while serving in the Army during World War I. Smallpox persisted in Canada until 1946, when vaccination campaigns eliminated it. . The last known naturally occurring case of smallpox was diagnosed on Oct. 26, 1977, in Merka, Somalia, according to the CDC. The smallpox vaccine was the first vaccine to be developed against a contagious disease. Therefore, Strategic Advisory Group of Experts on immunization (SAGE) was asked to respond to the following questions: Which vaccine should be recommended for use during an outbreak of smallpox and how many doses should be stockpiled? Another group, the Anti-Compulsory Vaccination League, was founded after the passage of the Vaccination Act of 1867,   which raised the age requirements for getting the smallpox vaccine from three months to 14 years [5] It contains live vaccinia virus, cloned from the same strain used in an earlier vaccine, Dryvax. /VSG As the COVID-19 vaccine begins distribution in the UK, it shares an anniversary with another vaccine that cured a disease that rocked the world – smallpox. By the 1940s, Wyeth was the leading U.S. manufacturer of the vaccine and the only manufacturer by the 1960s. Nevertheless, a notable outbreak occurred in Windsor, Ontario in 1924. About two months later Jenner inoculated James on both arms with material from a case of smallpox, with no effect; the boy was immune to smallpox. Two years after Kennedy's description appeared, March 1718, Dr. Charles Maitland successfully inoculated the five-year-old son of the British ambassador to the Turkish court under orders from the ambassador's wife Lady Mary Wortley Montagu, who four years later introduced the practice to England.[44]. This allowed exemption on production of a certificate of conscientious objection signed by two magistrates. While rabbitpox is known to be a laboratory strain of vaccinia, the connection between vaccinia and horsepox is still debated. [48] Fewster was a contemporary and friend of Jenner. For centuries smallpox was one of the world’s most-dreaded diseases. [73] Compulsory infant vaccination was regulated by only allowing access to school for those who had been vaccinated. Therefore, Jenner was not the first to try cowpox inoculation. Two reports on the Chinese practice of inoculation were received by the Royal Society in London in 1700; one by Dr. Martin Lister who received a report by an employee of the East India Company stationed in China and another by Clopton Havers. Although routine smallpox vaccination is no longer performed on the general public, the vaccine is still being produced to guard against bioterrorism and biological warfare. It was about a 1901 smallpox vaccination raid in New York — when 250 men arrived at a Little Italy tenement house in the middle of the night and set about vaccinating everyone they could find. He attracted a certain amount of local criticism and ridicule at the time then interest waned. Vaccinia's nearest cowpox relatives are the strains found in Russia, Finland, and Austria. The vaccinia strains are most similar to each other, followed by horsepox and rabbitpox. [82], Vaccine produced by Copeman's method was the only type issued free to public vaccinators by the English Government Vaccine Establishment from 1899. The strain was different from that used in the United States. This was criticised at the time but vaccines derived from horsepox were soon introduced and later contributed to the complicated problem of the origin of vaccinia virus, the virus in present-day vaccine. Collier, L. J Hyg 1955. [21], Calf lymph was the name given[22] to a type of smallpox vaccine used in the 19th century, and which was still manufactured up to the 1970s. [71] This intensified opposition, and the 1898 Vaccination Act introduced a conscience clause. [76], Until the end of the 19th century, vaccination was performed either directly with vaccine produced on the skin of calves or, particularly in England, with vaccine obtained from the calf but then maintained by arm-to-arm transfer;[77] initially in both cases vaccine could be dried on ivory points for short-term storage or transport but increasing use was made of glass capillary tubes for this purpose towards the end of the century. The cowpox was first used as a vaccine in 18 th century England. He observed that milkmaids who previously had caught cowpox did not catch smallpox and showed that inoculated vaccinia protected against inoculated variola virus. [33] Inoculation for smallpox does not appear to have been widespread in China until the reign era of the Longqing Emperor (r. 1567–1572) during the Ming Dynasty. There is no example of any one that has died in it, and you may believe I am very well satisfied of the safety of the experiment since I intend to try it on my dear little son. When the human body encounters vaccinia, it builds up antibodies to fight off the variola virus. A single blister rose up on the spot, but James soon recovered. [104][98] Since horsepox is now extinct in the wild, the origin of the smallpox vaccine may never be known. First smallpox vaccine for certain immune-compromised populations delivered under Project BioShield. Because of similarities between vaccinia and the smallpox virus, the antibodies produced against vaccinia have been shown to protect against smallpox. Chinese physicians discovered that when healthy people were exposed to smallpox scab tissue, they were less likely to get infected with the disease late… [citation needed], Edward Jenner was born in Berkeley, England. Voltaire does not speculate on where the Circassians derived their technique from, though he reports that the Chinese have practiced it "these hundred years". [90], A major contribution to smallpox vaccination was made in the 1960s by Benjamin Rubin, an American microbiologist working for Wyeth Laboratories. It was organised and co-ordinated by a World Health Organization (WHO) unit, set up and headed by Donald Henderson. The authors of the official World Health Organization (WHO) account Smallpox and its Eradication assessing Jenner's role wrote:[68]. In 1774 Jesty, a farmer of Yetminster in Dorset, observing that the two milkmaids living with his family were immune to smallpox, inoculated his family with cowpox to protect them from smallpox. The vaccine for small pox was the first vaccine ever developed. Dryvax is a freeze-dried calf lymph smallpox vaccine. Charles Creighton believed that uncontaminated vaccine itself was a cause of syphilis. From 1958 to 1977, the World Health Organization conducted a global vaccination campaign that eradicated smallpox, making it the only human disease to be eradicated. On May 14, 1796, Jenner took fluid from a cowpox blister and scratched it into the skin of James Phipps, an eight-year-old boy. Stockpiled vaccine has been used only for laboratory researchers working on orthopoxviruses. A devastating smallpox outbreak killed an estimated 400,000 people across Europe in the 18th century, including several reigning monarchs. The story of vaccines did not begin with the first vaccine–Edward Jenner’s use of material from cowpox pustules to provide protection against smallpox. It is not known how many Jenner vaccinated or challenged by inoculation with smallpox virus; e.g. It was approved for use in the United States by the Food and Drug Administration (FDA) on 31 August 2007. "[107], In the United Kingdom, controversy occurred regarding the company which had been contracted to supply the vaccine. Lady Mary Wortley Montagu, wife of the British ambassador to Ottoman Constantinople, is widely credited with introducing the process to Great Britain in 1721. Jenner developed a reproducible smallpox vaccine in 1798. Glycerine was sometimes used simply as a diluent by some continental vaccine producers. The children or young patients play together all the rest of the day and are in perfect health till the eighth. This caused confusion at the time, but would become important criteria in vaccine development. In 1796, Edward Jenner developed an effective vaccine that used cowpox to provoke smallpox immunity. [94] However, even as the disease was being eradicated there still remained stocks of smallpox virus in many laboratories. [9], Imvanex (Modified Vaccinia Ankara – Bavarian Nordic) is a non-replicating smallpox vaccine developed and manufactured by Bavarian Nordic. [31][52][53] It was an analysis of 23 cases including several individuals who had resisted natural exposure after previous cowpox. In fact, the term "vaccine" comes from the Latin word for cow, vaccinus, since the original small pox vaccine was made using the cow pox virus. [102] This work established vaccinia and cowpox as two separate viral species. (2003), "A case of severe monkeypox virus disease in an American child: emerging infections and changing professional values"; Wyeth package insert / U.S. Food and Drug Administration. However, the dried vaccine was 100% effective when reconstituted after 6 months storage at 37 °C (99 °F) allowing it to be transported to, and stored in, remote tropical areas. [34] In China, powdered smallpox scabs were blown up the noses of the healthy. [9] The vaccine is not routinely available to the U.S. public; it is, however, used in the military and maintained in the Strategic National Stockpile. Jenner assumed a causal connection but the idea was not taken up at that time. He concluded that cowpox inoculation was a safe alternative to smallpox inoculation, but rashly claimed that the protective effect was lifelong. Edward Jenner, the English physician who first developed the smallpox vaccine in 1796, believed that vaccination caused a fundamental change in … [citation needed], The development of whole genome sequencing in the 1990s made it possible to build a phylogenetic tree of the orthopoxviruses. Eventually, smallpox vaccination became mandatory in Massachusetts. [citation needed], In late 2001, the governments of the United States and the United Kingdom considered stockpiling smallpox vaccines, even while assuring the public that there was no "specific or credible" threat of bioterrorism. [18] Jynneos was formerly known as MVA-BN. He recovered quickly. The physician Valentine Seaman gave his children a smallpox vaccination using a serum acquired from Jenner. [55] In the case of arm-to-arm transfer there was also the risk of transmitting syphilis. [101]:64 In 1939, A. W. Downey showed that the vaccinia virus was serologically distinct from the "spontaneous" cowpox virus. Crucially all of at least four who Jenner deliberately inoculated with smallpox virus resisted it. It is the world's oldest smallpox vaccine, created in the late 19th century by American Home Products, a predecessor of Wyeth. [37], Stimulated by a severe epidemic, variolation was first employed in North America in 1721. It was completely eradicated in 1979. By 1930 Arizona, Utah, North Dakota and Minnesota prohibited compulsory vaccination, 35 states allowed regulation by local authorities, or had no legislation affecting vaccination, whilst in ten states, including Washington, D.C. and Massachusetts, infant vaccination was compulsory. [citation needed], Jenner sent a paper reporting his observations to the Royal Society in April 1797. ", "Open Collections Program: Contagion, The Boston Smallpox Epidemic, 1721", "Statue of Dr Edward Jenner near the Italian Fountains, Kensington Gardens - Scenic way to South Kensington to Birkbeck - 18 August 2001 - 3 of 4 - Part of Lachlan's London, UK 2001 Web Journal - part of Lachlan Cranswick's Personal Homepage", "An attempt at a new analysis of the mortality caused by smallpox and of the advantages of inoculation to prevent it. The Smallpox Vaccine Emergency Stockpile (SVES) was originally created by consolidating WHO Member State donations given in support of the Intensified Smallpox Eradication Programme. [61] Despite some concern about the safety of vaccination the mortality using carefully selected vaccine was close to zero, and it was soon in use all over Europe and the United States. [30] A method of inducing immunity known as inoculation, insufflation or "variolation" was practiced before the development of a modern vaccine and likely occurred in Africa and China well before the practice arrived in Europe. This was successful and in 1722 Caroline of Ansbach, the Princess of Wales, allowed Maitland to vaccinate her children. [11][12][13] On its path for the approval in the U.S., Imvamune undergoes additional series of evaluation studies. Based on initial tests with textile needles with the eyes cut off transversely half-way he developed the bifurcated needle. After drying the ampoules were sealed under nitrogen. ...scarred the wrists, legs, and forehead of the patient, placed a fresh and kindly pock in each incision and bound it there for eight or ten days, after this time the patient was credibly informed. It was one of the deadliest diseases known to humans, and to date (2016) the only human disease to have been eradicated by vaccination. A woman planning on conceiving should not receive smallpox immunization. [83] Although proper use of glycerine reduced bacterial contamination considerably the crude starting material, scraped from the skin of infected calves, was always heavily contaminated and no vaccine was totally free from bacteria. They make parties for this purpose, and when they are met (commonly fifteen or sixteen together) the old woman comes with a nutshell full of the matter of the best sort of small-pox and asks what veins you please to have opened. [59][60] By 1800, Jenner's work had been published in all the major European languages and had reached Benjamin Waterhouse in the United States – an indication of rapid spread and deep interest. The Chinese were the first to develop a primitive form of a vaccine around the 10th century, according to the NHS. As vaccination spread, some European countries made it compulsory. This confirmed his childhood suspicion, and he studied cowpox further, presenting a paper on it to his local medical society. be recognised as noninfectious vaccine, a different virus (e.g. The "beautiful milkmaid" seems to have been a frequent image in the art and literature of this period. In 1972, smallpox vaccines stopped being a … Routine vaccination against smallpox ended in the United States in the early 1970s as its incidence lessened.Certain U.S. military personnel and some civilian workers receive the smallpox vaccine due to the threat of bioterrorism. have questioned the possible effectiveness of such a vaccine. [2] Easy to use with minimum training, cheap to produce ($5 per 1000), using four times less vaccine than other methods, and repeatedly re-usable after flame sterilization, it was used globally in the WHO Smallpox Eradication Campaign from 1968. I am patriot enough to take pains to bring this useful invention into fashion in England, and I should not fail to write to some of our doctors very particularly about it if I knew any one of them that I thought had virtue enough to destroy such a considerable branch of their revenue for the good of mankind, but that distemper is too beneficial to them not to expose to all their resentment the hardy wight that should undertake to put an end to it. This document describes the WHO Smallpox Vaccine Emergency Stockpile (SVES) and the considerations and processes needed for countries to request vaccine in the event of a smallpox outbreak. [4] In February 2008 the CDC disposed of the last of its 12 million doses of Dryvax. The introduction of the injector gun was created to make mass immunization more efficient. This protected the virus during the freeze drying process. The patients would then develop a mild case of the disease and from then on were immune to it. Whole genome sequencing has shown that vaccinia is 99.7% identical to horsepox, with cowpox being a close relative. The Global Advisory Committee on Vaccine Safety (GACVS) was requested to review the safety of smallpox vaccination. [45], In the early empirical days of vaccination, before Louis Pasteur's work on establishing the germ theory and Joseph Lister's on antisepsis and asepsis, there was considerable cross-infection. [55] A further source of confusion was Jenner's belief that fully effective vaccine obtained from cows originated in an equine disease, which he mistakenly referred to as grease. Concern about its safety led to opposition and then repeal of legislation in some instances. Given the different set of vaccines available (1st generation vaccines used during the eradication campaign and made from the lymph or skin of inoculated animals, 2nd generation vaccines produced in tissue cells and further attenuated, and 3rd generation vaccines based on replicating or non-replicating virus) WHO needs to be able to make an informed decision on which vaccines to include in the stockpile for use in case of a re-emergence of smallpox. Jenner believed that both cowpox and smallpox were viruses that originated in the horse and passed to the cow. Smallpox vaccines produced and successfully used during the intensified eradication program are called first generation vaccines in contrast to smallpox vaccines developed at the end of the eradication phase or thereafter and produced by modern cell culture techniques. Smallpox, infectious disease that begins with fever and headache and proceeds to an eruption of the skin that leaves pockmarks. There is a set of old women who make it their business to perform the operation. It worked. However, it remained in use into the 1970s where a satisfactory cold chain was available. [66] John Fewster, a surgeon friend of Jenner's from nearby Thornbury, discussed the possibility of cowpox inoculation at meetings as early as 1765. Most, but still limited, information is available for Benjamin Jesty, Peter Plett and John Fewster. [72], In the United States vaccination was regulated by individual states, the first to impose compulsory vaccination being Massachusetts in 1809. The World Health Organization (WHO) declared smallpox eradicated in 1980.\"It was eradicated solely through vaccination. [46] In modern times, an effective scientific model and controlled production were important in reducing these causes of apparent failure or iatrogenic illness. In December 1979 they concluded that smallpox had been eradicated; a conclusion endorsed by the WHO General Assembly in May 1980. FDA/CBER Questions and Answers; Medication Guide; accessed 1 March 2008. The smallpox vaccine protects people from smallpox by helping their bodies develop immunity to smallpox. [14][15][16], Imvanex contains a modified form of the vaccinia virus, Modified vaccinia Ankara, which does not replicate in human cells and hence does not cause the serious side effects that are seen with replicating smallpox vaccines. William Woodville, one of the early vaccinators and director of the London Smallpox Hospital is thought to have contaminated the cowpox matter—the vaccine—with smallpox matter and this essentially produced variolation. 53; 76–101", "Incongruencies in Vaccinia Virus Phylogenetic Trees", "Equination (inoculation of horsepox): An early alternative to vaccination (inoculation of cowpox) and the potential role of horsepox virus in the origin of the smallpox vaccine", "The Immunological Relationship of the Virus of Spontaneous Cowpox to Vaccinia Virus", "Chasing Jenner's Vaccine: Revisiting Cowpox Virus Classification", "Talks on medicines to fight bio-terrorism", "Labour claims unravel over vaccine deal", Smallpox Vaccine: Contraindications, Administration, and Adverse Reactions, Quick Guide to Preexposure Smallpox Vaccination, Early smallpox Vaccination Certificate Norway 1821, Cedillo v. Secretary of Health and Human Services, https://en.wikipedia.org/w/index.php?title=Smallpox_vaccine&oldid=999019944, Short description is different from Wikidata, Chemical articles with unknown parameter in Infobox drug, Chemical articles without CAS registry number, Articles containing unverified chemical infoboxes, Articles containing potentially dated statements from August 2014, All articles containing potentially dated statements, Chemicals that do not have a ChemSpider ID assigned, Chemical pages without DrugBank identifier, Articles with unsourced statements from July 2020, All articles with specifically marked weasel-worded phrases, Articles with specifically marked weasel-worded phrases from March 2019, All articles with vague or ambiguous time, Vague or ambiguous time from October 2019, Articles with unsourced statements from September 2011, Articles with unsourced statements from February 2020, Wikipedia articles incorporating a citation from the 1911 Encyclopaedia Britannica with Wikisource reference, Creative Commons Attribution-ShareAlike License, Rx-only but withdrawn from many countries, This page was last edited on 8 January 2021, at 03:12. Many healthcare workers refused, worried about vaccine side effects, but many others volunteered. When autocomplete results are available use up and down arrows to review and enter to select. [31][32] The first clear reference to smallpox inoculation was made by the Chinese author Wan Quan (1499–1582) in his Douzhen xinfa (痘疹心法) published in 1549. . But it took more than 200 years and a worldwide vaccination program to eradicate the disease. [36], Variolation was also practiced throughout the latter half of the 17th century by physicians in Turkey, Persia, and Africa. Modern research suggests Jenner was trying to distinguish between effects caused by what would now[when?] [7][20], A droplet of ACAM2000 is administered by the percutaneous route (scarification) using 15 jabs of a bifurcated needle. It worked. 27 views Sponsored by Raging Bull, LLC Second generation smallpox vaccines use the same smallpox vaccine strains employed for manufacture of first generation vaccines or clonal virus variants plaque purified from traditional vaccine stocks, whereas third generation smallpox vaccines represent more attenuated vaccine strains specifically developed as safer vaccines at the end of the eradication phase by further passage in cell culture or animals. The vaccine is made from a virus called vaccinia, which is a poxvirus similar to smallpox, but less harmful.The smallpox vaccine contains live vaccinia virus, not a killed or weakened virus like many other vaccines. [3], The U.S. Centers for Disease Control and Prevention (CDC) kept a stockpile for use in case of emergency. . After world health authorities declared smallpox had been eradicated from nature in 1980, Wyeth stopped making the vaccine. Can smallpox vaccine prevent chickenpox or shingles? He followed up his observation that milkmaids who had previously caught cowpox did not later catch smallpox by showing that inoculated cowpox protected against inoculated smallpox. Smallpox is an ancient virus. The Act was met with opposition from people who demanded the right to control their bodies and those of their children. [92], Smallpox was eradicated by a massive international search for outbreaks, backed up with a vaccination program, starting in 1967. The safety update also included an overview of the safety of smallpox vaccines used in the smallpox eradication efforts. [97]:52–53 Some doctors followed up on this speculation by inoculating humans with horsepox. smallpox of the cow), the term devised by Jenner to denote cowpox and used in the long title of his An enquiry into the causes and effects of Variolae vaccinae, known by the name of cow pox.