• Research
  • Emissary
  • About
  • Experts
Carnegie Global logoCarnegie lettermark logo
DemocracyIran
  • Donate
Exaggerating the Threat of Bioterrorism

Source: Getty

Article

Exaggerating the Threat of Bioterrorism

The threat of bioterrorism has been greatly exaggerated. There are fewer state bioweapons programs today than 15 years ago and to date, no state is known to have assisted any nonstate or terrorist group to obtain biological weapons.

Link Copied
By Ben Bain and Joseph Cirincione
Published on Mar 16, 2006
Program mobile hero image

Program

Nuclear Policy

The Nuclear Policy Program aims to reduce the risk of nuclear war. Our experts diagnose acute risks stemming from technical and geopolitical developments, generate pragmatic solutions, and use our global network to advance risk-reduction policies. Our work covers deterrence, disarmament, arms control, nonproliferation, and nuclear energy.

Learn More

Milton Leitenberg is one of America’s leading scientific experts on biological weapons.  He is a senior research scholar at the University of Maryland and has been writing in the field for nearly 40 years.  His report “Assessing the Biological Weapons and Bioterrorism Threat,” published by the U.S. Army War College Strategic Studies Institute provides a much-needed antidote to the pervasive exaggeration of the bioterrorism threat.

Leitenberg notes at the beginning of his report:

 

For the past decade the risk and imminence of the use of biological agents by nonstate actors/terrorist organizations—“bioterrorism”—has been systematically and deliberately exaggerated. In the last year or two, the drumbeat had picked up. It may however become moderated by the more realistic assessment of the likelihood of the onset of a natural flu pandemic, and the accompanying realization that the U.S. Government has been using the overwhelming proportion of its relevant resources to prepare for the wrong contingency.

 

Leitenberg points out that there are fewer state bioweapons programs today than 15 years ago and “to date, no state is known to have assisted any nonstate or terrorist group to obtain biological weapons.”  Additionally, “there is no justification for imputing to real world terrorist groups capabilities in the biological sciences that they do not possess.” 

 

According to Leitenberg, the exaggeration of the threat developed as “bioterrorism” became an all-encompassing term for any biological weapon use, be it by state or non-state actors.  He writes, 

 

That simple switch in language made it easy to transfer levels of state capability to “terrorists.”  Everything became and was referred to as “bioterrorism.” This wiped out any discrimination, or attempt to discriminate, between the relevant capabilities of state programs and existing terrorist groups as they are known to date. 

 

The perceived threats were blown out of proportion:

 

The possibility of incidents involving low numbers of casualties evolved in 2 or 3 years to “mass casualty” terrorism, and in several more years to “Apocalyptic Terrorism.” Generic terrorist groups…were endowed with the prospective ability to genetically engineer pathogens. Yet the resources and capabilities available to states and to terrorist groups are vastly different. 

 

His carefully written monograph puts the bioterrorism threat in context with other pressing problems, such as malaria, tuberculosis, and HIV/AIDS (that together kill 5 million people a year), diarrheal diseases (kill 3.5 million a year), and smoking (kills 5 million people a year) – not to mention the massive casualties from a possible pandemic flu outbreak. 

 

Leitenberg systematically dissects the inflated assumptions behind scenarios used as the basis for bioterrorism gaming exercises in the US.  For example, the 2001 Dark Winter exercise, a scenario involving aerosolized smallpox, “used a person-to-person secondary transmission rate (RO) of 10, three times the historical average of three.”  The 2005 Atlantic Storm exercise made “grossly misleading assumptions” about the ease of creating and then dispersing the same biological agent, again a dry powder smallpox preparation, a feat that neither the US nor Soviet BW programs ever achieved. 

 

Is bioterrorism, as Dr. Tara O’Toole, head of the Center of Biosecurity at the University of Pittsburgh says, “one of the most pressing problems that we have on the planet today.”?  Leitenberg concludes, “No.  Absolutely not.”

 

This is a must-read for all who want to understand the interplay of biological weapons, terrorism and global threats. 

 

Related Links: 

 

“Assessing the Biological Weapons and Bioterrorism Threat,” Strategic Studies Institute of the U.S. Army War College (December 2005)

 

“Bioterrorism, Hyped,” LA Times op-ed by Milton Leitenberg (17 February, 2006)

 

“Bioweapons,” Book Review of Leitenberg’s book The Problem of Biological Weapons (2004) 

 

About the Authors

Ben Bain

Joseph Cirincione

Former Senior Associate, Director for NonProliferation

Authors

Ben Bain
Joseph Cirincione
Former Senior Associate, Director for NonProliferation
Joseph Cirincione
North AmericaUnited StatesSecurityNuclear Policy

Carnegie does not take institutional positions on public policy issues; the views represented herein are those of the author(s) and do not necessarily reflect the views of Carnegie, its staff, or its trustees.

More Work from Carnegie Endowment for International Peace

  • Article
    From Hormuz to the Maghreb: The Geopolitical Reach of a Gulf Crisis

    Morocco and Algeria, each in its own way, are having to navigate the global economic fallout of the U.S.-Israeli military campaign against Iran.

      Yasmine Zarhloule

  • Commentary
    Emissary
    Nolan’s "The Odyssey" Has a Colonialism Problem

    Despite Morocco’s hopes that its film industry would reap rewards, the blockbuster’s success will be tainted by controversy surrounding filming in occupied Western Sahara.

      • Sarah Yerkes

      Sarah Yerkes

  • Iranian President Mahmoud Ahmadinejad (C) visits the Natanz uranium enrichment facilities April 8, 2008
    Paper
    Demystifying the Nuclear Threshold

    The nuclear weapons threshold is increasingly important for proliferation strategy and policy. Policymakers should better understand the implications of the threshold phenomenon in the current international security environment and plausible strategies to deal with the growing challenge that it presents.

      Ariel (Eli) Levite, Toby Dalton

  • Paper
    Securing America’s Near Abroad: Recalibrating U.S. Policy Toward Haiti

    Helping to stabilize Haiti is in the United States’ national interest and can be done by making wise use of various foreign policy tools in addition to supporting international security forces.

      Christopher Shell

  • Aerial view of Washington DC
    Paper
    Network and Structural Power: The Four Trend Lines Weakening U.S. Leverage

    Networks—from international payments platforms to key economic sectors—underlie many aspects of U.S. power. But they are suffering under an extractive approach to foreign policy.

      Daniel W. Drezner

Get more news and analysis from
Carnegie Endowment for International Peace
Carnegie global logo, stacked
1779 Massachusetts Avenue NWWashington, DC, 20036-2103Phone: 202 483 7600
  • Research
  • Emissary
  • About
  • Experts
  • Donate
  • Programs
  • Events
  • Blogs
  • Podcasts
  • Contact
  • Annual Reports
  • Careers
  • Privacy
  • For Media
  • Government Resources
Get more news and analysis from
Carnegie Endowment for International Peace
© 2026 Carnegie Endowment for International Peace. All rights reserved.