A Terrifying Time for Bats

A Terrifying Time for Bats
By Merlin Tuttle
7/2/17

The past month has seen a virtual explosion of premature speculation presented as though it were now proven fact, much of it traceable to a single article titled, “Bats are global reservoir for deadly coronaviruses,” that appeared in the June 14, 2017 issue of Nature. We’ve already issued a Bat Flash alert responding to this article, and to predecessors, all apparently part of a single cleverly planned campaign.

An adult male Straw-colored fruit bat (Eidolon helvum) from Kenya. This is the species first blamed for the “index case” of Ebola in the 2014 outbreak in West Africa. The species was soon exonerated. In fact, it is so resistant to Ebola that it is an unlikely source. Recent studies suggest a source other than bats.

Sensational speculation has become widely cited as fact1, with spin-off damage that will be exceedingly difficult to reverse. All who truly care about bats have cause to be deeply concerned.

Due to scary speculation attempting to link the SARS outbreak of 2002 to bats, bats have recently become central in the search for viruses2.  Thus, rapid advances in viral detection alone may have caused major bias. Also, the number of viruses found in bats is not necessarily indicative of risk.2 Many viruses are innocuous or even beneficial,3 including some that are closely related to deadly ones.4 Finally, the paper in question is based on models, and models are notorious for mistaken conclusions, regardless of the amount of data analyzed.5

A far more meaningful analysis should have considered the historic rarity of viral spillover from bats to humans. Many media stories now claim bats to be the primary source of so-called “emerging infectious diseases” like Ebola, though most of these speculations remain unproven.6- 7

Thai women collecting guano in Rakang Cave. These women spend countless thousands of hours sweeping up the guano and bagging it while being pooped on by hundreds of thousands of fruit- and insect-eating bats high overhead and report no ill effects.

Proponents of such speculation still cannot explain why hundreds of bat biologists, millions of people who eat bats, and the millions more who share cities with huge bat colonies are no less healthy than others. They can’t explain why bats artificially infected with Ebola haven’t become contagious or why virologists haven’t even been able to find live virus in the thousands of bats examined. Certainly, like all other mammals, bats must be capable of harboring at least a few dangerous viruses. Nevertheless, bats still have one of our planet’s finest records of living safely with humans.1

Children begin helping collect guano almost as soon as they can walk.
It seems that, if disease from bats was a serious threat, certainly these happy children, working in Thailand’s Khao Chong Phran Cave should have been short-lived! While taking these photos, I wasn’t protected from any of the so-called “emerging diseases,” nor have I been protected anywhere else, and over decades of time, I too have remained healthy.
I first met this 96-year-old guano-collector in Thailand’s Rakang Cave in 1981. When I returned 31 years later, Siri Tanomsri and his only slightly younger, also guano-collecting, wife remained in outstanding health despite decades of working in a bat cave. Such historic evidence simply doesn’t support recent speculation that exposure to bats is dangerous.

Michael Osterholm, director at the Center for Infectious Disease Research and Policy at the University of Minnesota, Twin Cities, notes that scientists should be careful to distinguish between what is possible and what is likely. He points out that rabies, for example, is widespread in bats and readily infects humans. However, “If that was enough for transmission we should all be dying of bat rabies in the U.S.” The virus can be transmitted only if an infected bat bites a human. That rarely happens, so transmission is rare.2

Tourists observing 1.5 million free-tailed bats emerge from the Congress Avenue Bridge in Austin, Texas. When these bats began moving into newly created crevices beneath this mid-town bridge, health officials warned they were rabid and dangerous. Yet, by simply posting small signs asking visitors not to handle the bats, no one has been harmed in more than 35 years of mutually beneficial coexistence.

Additionally, we must question why so many limited health resources are being diverted to some of the world’s rarest diseases. Even if we lump all these together (including SARS, MERS, Nipa, Hendra, Marburg and Ebola) they have caused fewer than 20,000 deaths in two decades.8 In contrast, dog-transmitted rabies alone kills 60,000 humans annually9 with hardly a ripple of comment. And even that is tiny compared to other sources of human mortality, such as obesity10, which are far easier to prevent.

The only logical explanation for such a skewed emphasis appears to be solicitation of hundreds of millions of dollars in grants11for otherwise difficult-to-justify research.1 The last campaign against bats centered on rabies, rendering bat conservation nearly impossible in the 1970’s, while huge profits went to rabies and pest control industries.12 This time the profits are going to virus hunters11 with even more potential for harming bats.

Anyone paying attention will see a regularly repeated strategy. Over and over, the most sensationally exaggerated stories cite the same virus hunting scientists and their organization.13-16 They present themselves as bat-loving conservationists, but it’s time to ask if perhaps they don’t love big grants a bit more than bats!

Their strategy is becoming quite clear. Begin with a sensational headline, followed by a few paragraphs of apparently supporting statements from similarly motivated scientists. Appear to be bat conservation-minded by often saying that it’s not the bats’ fault. It’s because we’re invading their territory. 11,13-16 Sometimes (far from consistent) ending with an admission that the speculation has yet to be proven, including qualifying statements that bats are valuable and should never be killed. Never mind abundant evidence that people don’t tolerate, and often kill, animals they fear, particularly if bats are believed to be disease-laden.12 

The famous bat colony in Austin, Texas, consumes tons of crop and yard pests nightly, attracts millions of tourist dollars annually, and has harmed no one. Learning to live harmoniously with bats promotes public health by maintaining a safer environment with fewer pesticides. For anyone who simply doesn’t handle bats, the odds of harm are too remote to measure.

As in the Nature example, most subsequent reports focus on the sensational beginning, often completely omitting the more moderate ending, exactly what a clever PR firm, attempting to foment fear of bats would advise. Unfortunately, it’s working like magic for scientists who know better. Their greed isn’t just harming bats. It’s also harming public health,1 and eventually will compromise the credibility of science in general at a time when it is most needed.

Currently, there is no better way to help bats than for readers to complain to publishers of irresponsible stories.  We have already addressed the original one in Nature, but the many subsequent publishers, who typically focused only on the worst elements, also should be contacted. We encourage you to continue sharing your opinions with them and thank you for your participation on behalf of bats thus far.

 

 

References

  1. Tuttle, M.D. 2017. Give bats a break. Issues in Science and Technology. Spring, Pp 41-50
  2. Kupferschmidt, K. 2013. Bats may be carrying the next SARS pandemic. Science http://www.sciencemag.org/news/2013/10/bats-may-be-carrying-next-sars-pandemic
  3. Enriquez, J. and S. Gullans “Viruses, the Roadrunners of Evolution,” in Evolving Ourselves: How Unnatural Selection and Nonrandom Mutation are Changing Life on Earth (New York, NY: Penguin, 2015).
  4. Miranda, M.E.G. N.L.J. Miranda. 2011. Reston ebolavirus in humans and animals in the Philippines: A review. J. Infect Dis (2011) 204 (suppl_3): S757-S760.
  5. Saltelli, A. and S. Funtowiz. 2014. When all models are wrong. Issues in Sci. and Tech. XXX(2), http://issues.org/30-2/andrea/.
  6. Moratelli, R. and C. H. Calisher. 2015. Bats and zoonotic viruses: can we confidently link bats with emerging deadly viruses? Memorias do Instituto Oswaldo Cruz, 110, no. 1: 1-22.
  7. Leendertz, S. A. J. 2016. Testing new hypotheses regarding ebolavirus reservoirs,” Viruses 8, no. 30 (2016): 30.
  8. Annonymous, 2017. World Health Organization.
  9. Jackson, A.C. 2014. Rabies: Neurology. Pp 235-250 in Neglected Tropical Diseases and Conditions of the Nervous System. (M. Bentivoglio, E.A. Cavalheiro, K. Kristensson and N.B. Patel, eds.), Springer, New York and London, 391 pp.
  10. Calle, E.E.,C. Rodriguez, K.W. Thurmond, B.A. and M.J. Thun. 2003. Overweight, obesity, and mortality from cancer in a prospectively studied cohort of U.S. adults. New Engl. J. Med. 348:1625-1638.
  11. Doucleff, M. and J. Greenhalgh. 2017. Why killer viruses are on the rise. Natl. Pub. Radio, http://www.npr.org/sections/goatsandsoda/2017/02/14/511227050/why-killer-viruses-are-on-the-rise.
  12. Tuttle, M.D. 2013. Threats to bats and educational challenges. Pp. 363-391 in Bat evolution, ecology and conservation (R.A. Adams and S.C. Pedersen, eds.), Springer Science, New York.
  13. Kupferschmidt, K. 2017. Bats really do harbor more dangerous viruses than other species. Science, http://www.sciencemag.org/news/2017/06/bats-really-do-harbor-more-dangerous-viruses-other-species?utm_campaign=news_weekly_2017-06-23&et_rid=314511943&et_cid=1401874.
  14. World staff. 2017. Bats are special. But not in a good way. PRI’s The World, Health and Medicine, https://www.pri.org/stories/2017-06-27/bats-are-special-not-good-way.
  15. Thomas, D. 2017. Bats likely source of next worldwide disease outbreak, study finds. Austin Amer. Statesman, http://www.statesman.com/news/local/bats-likely-source-next-worldwide-disease-outbreak-study-finds/pbAeBOrUUvrreIwXTQLmTI/
  16. McKay, B. 2017. Where will the next pandemic come from? Likely from bats. Wall Street Journal, https://www.wsj.com/articles/predicting-the-next-pandemic-1498064763?mod=e2tw&mg=prod/accounts-wsj.

 

 

 

 

 

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4 thoughts on “A Terrifying Time for Bats

  1. I would be happy to ontact the publishers. Would you be able to provide us with email addresses and sample text as a guide?
    No

  2. Bats should not be made scapegoats, especially since they are one of the world’s most effective and efficient environmentalists. They eat millions of mosquitos, which are known transmitters of disease, and are invaluable pollinators. Without a healthy bat population, the ecosystem would most certainly suffer.

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