Author Information: Alan Sokal, New York University, email@example.com.
Sokal, Alan. “A Dialogue on a Paradigm Case of Bad Science: Comment on Brian Martin.” Social Epistemology Review and Reply Collective 8, no. 5 (2019): 36-47.
The following article replies to Martin, Brian. “Bad Social Science.” Social Epistemology Review and Reply Collective8, no. 3 (2019): 6-16.
I am very sympathetic to Professor Martin’s central thesis: that much social and political commentary — by citizens, journalists and even academics — makes
claims about society and social relationships that fall very far short of what social scientists consider good scholarship. This might be due to using false or misleading evidence, making faulty arguments, drawing unsupported conclusions or various other severe methodological, empirical or theoretical deficiencies.
I also agree that
there is value in a more systematic examination of different sorts of everyday bad social science. Such an examination can point to what is important in doing good social science and to weaknesses in assumptions, evidence and argumentation. It can also provide insights into how to defend and promote high-quality social analysis.
And finally, I agree completely that ad hominem argument is ethically reprehensible and intellectually vacuous, as is the misrepresentation of an opponent’s claims or arguments; and that ambiguous terminology, failing to summarize clearly an opponent’s main arguments, and criticizing an opponent’s weakest arguments while ignoring the strongest ones are also logically and ethically deficient strategies (though these sins are perhaps slightly less iniquitous than ad hominem and misrepresentation).
I also endorse Martin’s suggestion that one should verify claims — particularly derogatory claims about opponents — with the people involved, and more generally that it can be useful to send drafts of articles to people with opposing views, soliciting their comments and suggestions prior to publication. Indeed, I can personally testify that Martin practices what he preaches; and I beg the reader’s indulgence to tell this story in a bit of detail, because I think it illustrates well why Martin’s suggestion is so valuable.
Friendship and Intellectual Integrity Among Conflicts
Back in January 2019, Professor Martin sent me a draft of his almost-completed article, saying:
Attached is a draft article, “Bad social science”. In it, I discuss your hoax [Sokal 1996]. Could you have a look at the relevant subsection . . . and let me know about any inaccuracies or omissions? Comments on any other part of the article would be welcome too.
After reading his draft, I replied:
I want first to say “thank you” once again for sending this draft to me for my comments prior to publishing it . . . For indeed, I believe that you have seriously misrepresented my views.
And I went on to explain:
The first sentence [of the section discussing my hoax] is fine. You then say: “He [Sokal] concluded from this episode that cultural studies as a field lacked rigour and quality control.” But where is the precise citation to back up such a claim? Your footnote 24 [deleted from the final version] cites a 465-page book [Sokal 2008], but without any citation of page numbers, much less precise quotations. (I am always irritated by such vague citations, which are useless to the reader — but actually worse than useless because they give the impression of documentation without the reality of it.) In fact, I don’t know anywhere in my writings where you could find a quotation asserting what you have written, because it is not at all my view. Indeed, I have many times explicitly written the exact opposite!
After which I quoted at length from an article I wrote about a year after the hoax, which reads in part:
From the mere fact of publication of my parody I think that not much can be deduced. It doesn’t prove that the whole field of cultural studies, or cultural studies of science — much less sociology of science — is nonsense. Nor does it prove that the intellectual standards in these fields are generally lax. (This might be the case, but it would have to be established on other grounds.) . . .
Professor Martin immediately responded to thank me for “sav[ing] [him] from making some unfortunate mistakes”, and two weeks later he sent me a revised version of his article for my comment; I found its account of my views completely acceptable, and it is the version that is published here.
Let me also stress that Martin did not take the easy way out: making the minimum changes to his text to avoid stating an outright falsehood, while nevertheless holding onto the essence of his conclusion. Rather, he did the intellectually honorable thing: completely revising his conclusion in light of the new evidence I had given him.
And that, indeed, is what is so valuable about sending drafts to people with opposing views: it gives us the opportunity to change and improve our ideas, via exposure to new evidence and/or persuasive new reasoning.
On Matters of Fact and Rhetoric in Vaccine Debates
I do not feel qualified to comment on the details of Martin’s analysis of the Australian vaccination debate, with which I am not familiar. However, I can make a few brief comments about his examples:
1) I agree with Martin that it is justified to call someone a “liar” only if one has strong evidence that the person in question is consciously intending to deceive. In the type of situation cited by Martin, a more appropriate accusation might be “persisted in making claims that had been refuted by strong evidence, without addressing that evidence”.
Of course, as Martin replied to me, participants on different sides of the controversy might well have “different assumptions about what is relevant evidence . . . and different assessments of the relevance of evidence”. But these assumptions can and should be made explicit, and these assessments openly debated. If one side (or both sides) in the controversy refuses to do so, then that refusal deserves to be criticized.
2) I also agree with Martin that it is unhelpful to use inflammatory terms such as “babykiller”, even when the implicit factual claim — that discouraging vaccination causes the death of children from vaccination-preventable diseases — is supported by evidence. Furthermore, as concerns measles — the disease most at danger of resurgence due to anti-vaccination campaigns — death is fortunately nowadays very rare in the developed countries, occurring in only one or two cases per thousand.
So, despite large-scale outbreaks of measles on a scale not seen in decades — like the one that is occurring in the USA even as I write, with 704 cases thus far, of which 66 hospitalizations — there have not yet been any deaths. Consequently, if we were to consider the situation of the USA, Europe or Australia in isolation from the rest of the world, “babykiller” would indeed be a gross exaggeration.
But ideas (such as the alleged dangers of vaccination) are not stopped by national borders; and the nonchalance available to parents in the rich countries does not, alas, extend to the vast majority of humanity. As the Wikipedia article on measles usefully summarizes:
Measles affects about 20 million people a year, primarily in the developing areas of Africa and Asia. . . . It is one of the leading vaccine-preventable disease causes of death. In 1980, 2.6 million people died of it, and in 1990, 545,000 died; by 2014, global vaccination programs had reduced the number of deaths from measles to 73,000. Rates of disease and deaths, however, increased in 2017 to 2019 due to a decrease in immunization. . . . Most of those who die from the infection are less than five years old.
In developed countries, death occurs in one to two cases out of every 1,000 (0.1–0.2%). In populations with high levels of malnutrition and a lack of adequate healthcare, mortality can be as high as 10%. In cases with complications, the rate may rise to 20–30%.
The World Health Organization reports that
A previously described model for estimating measles disease and mortality was updated with new data on measles vaccination coverage and cases . . . During 2000–2017, as compared with no measles vaccination, measles vaccination prevented an estimated 21.1 million deaths globally.
So perhaps “babykiller” (or rather, “child-killer”) is not so out of line, after all.
Still, I agree with Martin that when accusations such as “babykiller” are employed without citation of evidence to support the implicit factual claim, this constitutes bad social science.
On the Miserable Persistence of Wakefield
3) With regard to the notorious case of Andrew Wakefield, Martin says that
Incorrect statements about Wakefield are commonplace, for example that he lost his medical licence due to scientific fraud. It is a simple matter to check the facts, but apparently few do this.
So I did check the facts — which is indeed a fairly simple matter, though a bit time-consuming to do properly — and obtained results that are in stark contrast to Martin’s portrayal.
In response to accusations of scientific fraud and other ethical violations in the research reported by Wakefield and his co-authors in the Lancet (Wakefield et al. 1998) — which purported to find a possible causal link between the measles–mumps–rubella (MMR) vaccination and autism — the United Kingdom’s General Medical Council (GMC) conducted an investigation that involved “evidence and submissions for 148 days over a period of two and a half years” followed by 45 days of deliberation in camera, and which applied the evidentiary standard of proof “beyond reasonable doubt”. The GMC report began its analysis of the Lancet paper by observing that Wakefield
knew or ought to have known that [his] reporting in the Lancet paper of a temporal link between the syndrome [he] described [gastrointestinal disease and developmental regression in a group of previously normal children] and the MMR vaccination,
i) had major public health implications,
ii) would attract intense public and media interest,
and that he
i) knew or ought to have known the importance of accurately and honestly describing the patient population,
ii) had a duty to ensure that the factual information in the paper and provided by [him] in response to queries about it was true and accurate,
iii. had a duty to disclose to the Editor of the Lancet any disclosable interest including matters which could legitimately give rise to a perception that [he] had a conflict of interest.
The report found that Wakefield’s conduct was “dishonest” and “irresponsible” in all three aspects:
1) The Lancet paper — of which Wakefield was the senior author — provided “a misleading description of the patient population” and of the process by which the patients were recruited, implying — albeit without stating explicitly — that
the children who were the subject of the paper . . . [came by] a routine referral to the gastroenterology department in relation to symptoms which included gastrointestinal symptoms [and by] a routine process in which the investigators had played no active part.
The GMC found both implied assertions to be false and judged Wakefield’s behavior to be “dishonest”, “irresponsible” and “contrary to your duty to ensure that the information in the paper was accurate”.
2) In response to critics’ worries that there might have been a biased selection of patients, Wakefield responded in the Lancet by stating unequivocally that
These children have all been seen expressly on the basis that they were referred through the normal channels (eg, from general practitioner, child psychiatrist, or community paediatrician) on the merits of their symptoms.
The GMC determined that this statement was “dishonest”, “irresponsible” and “contrary to your duty to ensure that the information provided by you was accurate”:
The Panel has found that your statement . . . does not respond fully and accurately to the queries made by correspondents to the Lancet . . . . [Y]ou knew that this statement omitted necessary and relevant information, such as the active role you played in the referral process, and the fact that the referral letters in four cases made no mention of any gastrointestinal symptoms and the fact that the investigations had been carried out under Project 172-96 for research purposes. Therefore, the Panel is satisfied that your conduct in this regard was dishonest and irresponsible.
In response to another correspondent’s suspicion that some of Wakefield’s patients might be connected to the MMR litigation — a potential source of selection bias — Wakefield admitted for the first time that “one author (AJW) has agreed to help evaluate a small number of these children on behalf of the Legal Aid Board” — a vast understatement, as we shall soon see — but insisted categorically that “No conflict of interest exists.”
Ironically, Wakefield’s reply began with the correct observation that “Bias occurs in science when data are either wittingly or unwittingly concealed.”
3) Similarly, a month after the Lancet article, at an important scientific meeting at the Medical Research Council
convened to examine the evidence relating to measles or measles vaccine and chronic intestinal inflammation, you were asked about the issue of bias in generating the series of cases including the twelve children in the Lancet paper and you stated that all patients reviewed so far had come through General Practitioners or paediatricians by “the standard route”
— a statement that the GMC found once again to be “dishonest”, “irresponsible” and “contrary to your duty to ensure that the information provided by you was accurate”:
The Panel has taken into account that this was an important scientific meeting to consider the implications of your published research and the major public health implications arising from it. The Panel has found that your responses to the questions raised at this meeting were inaccurate.
The Panel is satisfied that you knew that your response to the questions was factually wrong. The statement you made would be considered by ordinary standards of reasonable and honest people to be dishonest. The Panel is satisfied that your conduct in this regard was dishonest and irresponsible.
Conflicts of Interest at the Root of Matters
The report also found several undisclosed conflicts of interest:
4) Involvement in MMR litigation: Starting in 1996— two years before the Lancet article — Wakefield was
a) involved in advising Richard Barr, a solicitor acting for persons alleged to have suffered harm caused by the administration of the MMR vaccine, as to the research that would be required to establish that the vaccine was causing injury
b) Mr Barr had the benefit of public funding from the Legal Aid Board in relation to the pursuit of litigation against manufacturers of the MMR vaccine (“the MMR litigation”)
c) [Wakefield] provided Mr Barr with,
i) costing proposals for a research study . . .
ii) a protocol, giving details of the research study . . .
d) On 22 August 1996 the Legal Aid Board agreed to provide a maximum cost of £55,000 to fund the items in the Costing Proposal . . .
e) The Legal Aid Board provided funding in two instalments of £25,000, in late 1996 and in 1999 respectively . . . 
But that is not all: in December 2006 journalist Brian Deer learned, pursuant to a Freedom of Information Act request, that the Legal Services Commission (formerly Legal Aid Board) had paid Wakefield the staggering sum of £435,643 fees plus £3,910 expenses as an “expert” in the MMR litigation.
Following the Patent Money
5) Patent applications: On 5 June 1997 — more than eight months before the Lancet article was published — Wakefield filed a patent application for a new measles vaccine to replace the standard MMR vaccine, asserting that this would avoid the inflammatory bowel disease (IBD) and regressive behavioural disease (RBD, i.e. autism) that is, according to the application, associated with MMR vaccination. A revised application was filed on 4 June 1998, three months after the Lancet paper; it stated inter alia that
It has now also been shown that use of the MMR vaccine . . . results in ileal lymphoid nodular hyperplasia, chronic colitis and pervasive developmental disorder including autism (RBD), in some infants.
— and this despite the unambiguous admission in the Lancet paper that
We did not prove an association between measles, mumps and rubella vaccine and the syndrome described.
It is telling that at the press conference announcing the Lancet article, as well as in many subsequent forums, Wakefield forcefully advocated single measles, mumps and rubella vaccinations, spaced 12 months apart, in place of the combined MMR vaccine.
Wakefield’s lucrative involvement in the MMR litigation and his patent application represented glaring conflicts of interest, which he did not disclose to the Editor of the Lancet or to the Ethics Committee at the Royal Free Hospital, and which were only revealed publicly many years later, by investigative journalist Brian Deer.
In short, items 1–3 above constitute clear instances of scientific fraud; items 4–5 constitute gross and undisclosed conflicts of interest; and the two transgressions clearly work in tandem.
Finally, the GMC report also found Wakefield guilty of several other ethical violations, including invasive procedures (such as lumbar puncture) on child patients that were not clinically indicated.
Four months after this report, the GMC weighed the entire case: it determined that any single one of several proved allegations — most notably the failure to disclose conflicts of interest, and the breach of ethical constraints on research — constituted, in and of itself, Serious Professional Misconduct. Combining the many serious violations, the GMC concluded that no sanction short of de-registration would be
sufficient or appropriate against a background of several aggravating factors and in the absence of any mitigating submissions made on [Wakefield’s] behalf. Dr Wakefield’s continued lack of insight as to his misconduct serve [sic] only to satisfy the Panel that suspension is not sufficient and that his actions are incompatible with his continued registration as a medical practitioner.
Substantiating Fraud Among Many Violations
In conclusion: it is not quite correct to say that Wakefield lost his medical licence due to scientific fraud. Rather, he lost his medical licence due to a long series of serious ethical transgressions that included, among other things, scientific fraud.
The scientific fraud seems, in fact, to have loomed smallest in the GMC’s reckoning of Wakefield’s misdeeds, but in the long run it will surely be the gravest: if the scare that Wakefield started, and that he continues to abet, causes even a 5% increase in measles incidence worldwide— an extremely modest scenario — it will be responsible for more than 50,000 avoidable child deaths in the coming decade alone.
I wish to thank Brian Martin for giving me permission to quote from his now-superseded preliminary draft, as well as for helpful comments on my own draft.
Contact details: firstname.lastname@example.org
Bednarczyk, Robert A. et al. 2019. Current landscape of nonmedical vaccination exemptions in the United States: Impact of policy changes. Expert Review of Vaccines 18(2): 175–190.
Boseley, Sarah. 1998a. Alert over child jabs. The Guardian, 27 February, p. 1.
Boseley, Sarah. 1998b. MMR vaccination fears ‘not justified’: No evidence of link to autism or bowel disease, scientists say. The Guardian, 25 March, p. 3.
Bower, Hilary. 1998. Link with bowel disease fuels controversy over vaccine. British Medical Journal 316: 723 (7 March).
Bradford, W. David and Mandich, Anne. 2015. Some state vaccination laws contribute to greater exemption rates and disease Outbreaks in the United States. Health Affairs 34(8): 1383–1390.
Centers for Disease Control and Prevention. 2015. Epidemiology and Prevention of Vaccine Preventable Diseases, 13th edition. Washington, D.C.: Public Health Foundation. Chapter 13: Measles. Available on-line at http://www.cdc.gov/vaccines/pubs/pinkbook/meas.html
Deer, Brian. n.d. #1. Royal Free MMR video news release, 1998. Available on-line at http://briandeer.com/wakefield/royal-video.htm
Deer, Brian. n.d. #2. Andrew Wakefield’s vaccine patent. Available on-line at http://briandeer.com/wakefield/vaccine-patent.htm
Deer, Brian. n.d. #3. Secret payments to MMR Wakefield. Available on-line at http://briandeer.com/wakefield/legal-aid.htm
Deer, Brian. 2012. Amended declaration of Brian Deer in support of defendants’ anti-SLAPP motion to dismiss. In the District Court of Travis County, Texas, 250th Judicial District. Dated 9 July 2012. Available on-line at http://briandeer.com/solved/slapp-amended-declaration.pdf
General Medical Council (U.K.). 2010a. Fitness to practise panel hearing, 28 January 2010. Available on-line at http://briandeer.com/solved/gmc-charge-sheet. pdf
General Medical Council (U.K.). 2010b. Dr Andrew Jeremy Wakefield, Determination on Serious Professional Misconduct (SPM) and sanction, 24 May 2010.Available on-line at http://web.archive.org/web/20110809092833/http://www.gmc-uk.org/Wakefield_SPM_and_SANCTION.pdf_32595267.pdf
Intellectual Property Office (U.K.). 1997. Pharmaceutical composition for treatment of ibd and rbd. Patent application GB9711663.6, 5 June 1997. Available on-line at http://www.ipo.gov.uk/p-ipsum/Case/ApplicationNumber/GB9711663.6
Katkin, Kenneth. 2003. Scientific fraud. In: Dictionary of American History, 3rd ed., edited by Stanley I. Kutler, vol. 7, pp. 277–279. New York: Charles Scribner’s Sons. Available on-line at http://link.galegroup.com/apps/doc/CX3401803766/GVRL?u=new64731&sid=GVRL&xid=a44f927 and http://www.encyclopedia.com/history/dictionaries-thesauruses-pictures-and-press-releases/scientific-fraud
Lo, Nathan C. and Hotez, Peter J. 2017. Public health and economic consequences of vaccine hesitancy for measles in the United States. JAMA Pediatrics 171(9): 887–892.
Martin, Brian. 1992. Scientific fraud and the power structure of science. Prometheus 10: 83–98. Available on-line at http://www.uow.edu.au/~/bmartin/pubs/92prom.html
Martin, Brian. 2019. Bad social science. Social Epistemology Review and Reply Collective 8, no. 3: 6–16. Available on-line at https://social-epistemology.com/2019/03/05/bad-social-science-brian-martin/
McNeil, Donald G., Jr. 2019. Measles surges past 700th case in U.S. outbreak.
New York Times, April 29, page A1. Available on-line at http://www.nytimes.com/
Murray, Ian. 1998a. Health chief defends triple vaccine. The Times [London],13 March, p. 10.
Murray, Ian. 1998b. Triple baby vaccine is safe, experts tell parents. The Times [London], 25 March, p. 11.
Phadke, Varun H. et al. 2016. Association between vaccine refusal and vaccine- preventable diseases in the United States: A review of measles and pertussis. Journal of the American Medical Association 315(11): 1149–1158.
Sokal, Alan. 1996. Transgressing the boundaries: Towards a transformative hermeneutics of quantum gravity. Social Text #46/47 (Spring/Summer): 217–252. Available on-line at http://physics.nyu.edu/sokal/#transgress [Reprinted with annotations in Sokal 2008, chapter 1.] Sokal, Alan. 1998. What the Social Text affair does and does not prove. In: A House Built on Sand: Exposing Postmodernist Myths about Science, edited by Noretta Koertge, pp. 9–22. New York–Oxford: Oxford University Press. Available on-line at http://physics.nyu.edu/sokal/#noretta [Reprinted in slightly condensed form in Sokal 2008, chapter 5.]
Sokal, Alan. 2008. Beyond the Hoax: Science, Philosophy and Culture. Oxford– New York: Oxford University Press.
Wakefield, Andrew. 1998. Author’s reply. The Lancet 351: 1356 (2 May).
Wakefield, Andrew. 2003. Regressive behavioral disorder diagnosis. United States Patent US 6,534,259 B1. Filed March 23, 2000; granted March 18, 2003; normal expiration date June 4, 2018; expired March 18, 2011 due to non-payment of maintenance fees. Available on-line at http://portal.uspto.gov/pair/PublicPair
Wakefield, Andrew Jeremy and Fundenberg [sic], Hugh. 1998. UK Patent Application GB 2 325 856 A, filed 4 June 1998, published 9 December 1998. Available on-line at http://briandeer.com/mmr/1998-vaccine-patent.pdf
Wakefield, A.J., Murch, S.H., Anthony, A. et al. 1998. Ileal-lymphoid-nodular hyperplasia, non-specific colitis, and pervasive developmental disorder in children. The Lancet 351: 637–641 (28 February). Retraction: The Lancet 375: 445 (2010).
World Health Organization. 2018. Progress towards regional measles elimination – worldwide, 2000–2017. Weekly Epidemiological Record 93: 649–660 (30 November). Available on-line at https://www.who.int/wer/2018/wer9348/en/
 Sokal (1998, p. 11).
 Centers for Disease Control and Prevention (2015, p. 211).
 McNeil (2019). See also Bradford and Mandich (2015), Phadke et al. (2016), Lo and Hotez (2017) and Bednarczyk et al. (2019) for related statistical information concerning the public-health consequences of non-medical exemptions to immunization.
 World Health Organization (2018, p. 656; see also p. 657, Figure 1 for a graph with error bars).
It is only fair to observe that the error bars (95% confidence limits) are fairly large; the actual
number of avoided deaths could be as small as 14 million or as large as 28 million.
 That is, all cases in which the Panel felt there existed reasonable doubt were labeled “found not proved” and were considered to be resolved in favor of Dr. Wakefield. General Medical Council (2010a, p. 2).
 General Medical Council (2010a, p. 45, item 33).
 General Medical Council (2010a, pp. 44–46, items 32–34).
 Wakefield (1998).
 General Medical Council (2010a, p. 47, item 35).
 Wakefield (1998).
 General Medical Council (2010a, pp. 47–48, item 36).
 General Medical Council (2010a, pp. 4–6, items 3 and 4).
 Deer (n.d. #3). For reasons unknown to me, the GMC report does not mention these latter payments.
 Intellectual Property Office (1997); Deer (n.d. #2); General Medical Council (2010a, p. 49, item 38).
 Wakefield and Fundenberg (1998, pp. 1–2). See also similar statements on pp. 3–4. Two years later, Wakefield filed a companion patent application in the USA, with almost identical text. This latter patent was granted in 2003, but — curiously — covering only “a method for the diagnosis of Regressive Behavioral Disease”, not the vaccine (Wakefield 2003). Since the dossier at the U.S. Patent Office website shows a “non-final rejection” on September 28, 2001 and a “final rejection” on July 1, 2002, followed by a final “notice of allowance” on October 22, 2002, my guess —which would require further investigation to check — is that the claims for the vaccine were rejected, but then, after correspondence with Wakefield’s lawyers, revised claims for the diagnosis method were allowed.
 Wakefield et al. (1998, p. 641).
 Boseley (1998a); Deer (n.d. #1); Bower (1998); Murray (1998a). It should be noted that single vaccinations carry dangers of their own: as Sir Kenneth Calman, U.K. Chief Medical Officer, pointed out, “Giving the vaccinations separately would mean three visits and three injections. For a minimum of two years a child would not be immunised against a disease which could kill or maim. I am not prepared to encourage something which might harm children.” (Murray 1998b; see also Boseley 1998b).
 General Medical Council (2010a, pp. 7–11, items 5–7 and pp. 49–50, item 39). See also Deer (2012) for an informative chronology.
 The term “scientific fraud” does not appear to have any universally accepted definition, but it is generally understood to mean something like “intentional misrepresentation of the methods, procedures, or results of scientific research” (Katkin 2003, p. 277). The related term “research misconduct” is formally defined by the U.S. government to mean “fabrication, falsification, or plagiarism”, where “falsification” is defined as “manipulating research materials, equipment, or processes, or changing or omitting data or results such that the research is not accurately represented in the research record” (42 CFR 93.103 and 45 CFR 689.1). For what it’s worth, Martin (1992) criticizes this definition of scientific fraud as overly narrow.
 General Medical Council (2010a, pp. 11–42, items 8–29 and pp. 50–55, items 40–42). Some of these allegations were “found proved” and others were “found not proved”.
 Strangely, while the misleading statements in the Lancet article and subsequent forums were repeatedly called “dishonest” and “irresponsible”, the GMC final report did not single them out as constituting Serious Professional Misconduct in their own right (General Medical Council 2010b, pp. 4–5). Perhaps this is because the GMC is a medical council and is therefore most concerned with medical ethics in the narrow sense, i.e. the protection of the welfare of doctors’ patients.
 General Medical Council (2010b, p. 9).
 See footnote 22 above.
 Compared to what it would have been without the scare.
 This is based on the current (2017) figure of approximately 110,000 measles deaths per year (World Health Organization 2018, p. 656).