SIGA Technologies Inc.

SIGA to Present ST-246 to the World Health Organization

Wednesday 12 November 2008

Chief Scientific Officer will present ST-246 progress and human clinical safety study data

NEW YORK, November 12, 2008 -- SIGA Technologies, Inc. (Nasdaq: SIGA),

company specializing in the development of pharmaceutical agents to fight bio-warfare

pathogens today announced that Dr. Dennis E. Hruby, SIGA's Chief Scientific Officer,

will be presenting SIGA's progress in developing its lead drug candidate, ST-246, an

antiviral for smallpox and other orthopoxviruses, to the World Health Organization

(WHO) Advisory Committee on Variola Virus Research on November 19, 2008 in

Geneva, Switzerland.

Dr. Hruby commented on the upcoming presentation: ``It is an honor to return to the

World Health Organization to provide an update on the progress that has been made with

ST-246 and our goal of commercializing this drug. Since our last WHO presentation,

there have been several favorable developments, most notably the encouraging results of

our multi-dose human clinical safety trial. We have also initiated our regulatory process

in the European Union and recently received an additional $75 million in funding in the

form of two contracts from the NIH and BARDA for further development of ST-246. The

first $55 million provides funding for the development of additional formulations and

smallpox-related indications, and the second $20 million was awarded to accelerate

therapeutic development and large scale manufacturing. With this funding, we intend to

assure that we will have the capacity to provide this antiviral to a large population in the

event of a smallpox attack.''

Dr. Hruby continued, ``The continuing work of this WHO Advisory Committee

emphasizes the importance that the global community places on the threat of smallpox

being used as a bioweapon. An attack using this virus on any scale could have a

devastating global health and economic affect. The interest this Committee has shown in

the ST-246 development process leads us to believe that we are on the right path in

developing an antiviral that can provide countries throughout the world the proper

defense in the event of a smallpox attack.''

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About SIGA Technologies, Inc.

SIGA Technologies is applying viral and bacterial genomics and sophisticated

computational modeling in the design and development of novel products for the

prevention and treatment of serious infectious diseases, with an emphasis on products for

biological warfare defense. SIGA believes that it is a leader in the development of

pharmaceutical agents to fight potential biowarfare pathogens. In addition to small pox,

SIGA has antiviral programs targeting other category A pathogens, including

arenaviruses (Lassa Fever, Junin, Machupo, Guanarito, Sabia, and lymphocytic

choriomeningitis), Dengue Virus, and the filoviruses (Ebola and Marburg). For more

information about SIGA, please visit SIGA's website at http://www.siga.com.

The SIGA Technologies, Inc. logo is available at

http://www.globenewswire.com/newsroom/prs/?pkgid=4504

Forward Looking Statement

This press release contains or implies certain ``forward-looking statements'' within the

meaning of the Private Securities Litigation Reform Act of 1995, as amended, including

statements regarding the efficacy of potential products, the timelines for bringing such

products to market and the continued development and possible eventual approval of

such products. Forward-looking statements are based on management's estimates,

assumptions and projections, and are subject to uncertainties, many of which are beyond

SIGA's control. Actual results may differ materially from those anticipated in any

forward-looking statement. Factors that may cause such differences include the risks that

(a) potential products that appear promising to SIGA or its collaborators cannot be shown

to be efficacious or safe in subsequent pre-clinical or clinical trials, (b) SIGA or its

collaborators will not obtain appropriate or necessary governmental approvals to market

these or other potential products, (c) SIGA may not be able to obtain anticipated funding

for its development projects or other needed funding, (d) SIGA may not be able to secure

funding from anticipated government contracts and grants, (e) SIGA may not be able to

secure or enforce sufficient legal rights in its products, including sufficient patent

protection for its products and (f) regulatory approval for SIGA's products may require

further or additional testing that will delay or prevent approval. More detailed

information about SIGA and risk factors that may affect the realization of forwardlooking

statements, including the forward-looking statements in this press release, is set

forth in SIGA's filings with the Securities and Exchange Commission, including SIGA's

Annual Report on Form 10-K for the fiscal year ended December 31, 2007, and in other

documents that SIGA has filed with the Commission. SIGA urges investors and security

holders to read those documents free of charge at the Commission's Web site at

http://www.sec.gov. Interested parties may also obtain those documents free of charge

from SIGA. Forward-looking statements speak only as to the date they are made, and,

except for any obligation under the U.S. federal securities laws, SIGA undertakes no

obligation to publicly update any forward-looking statement as a result of new

information, future events or otherwise.

Contact:

KCSA Strategic Communications

Todd Fromer / Marybeth Csaby / David Burke

212-896-1215 / 1236 / 1258

Tfromer@kcsa.com / mcsaby@kcsa.com / dburke@kcsa.com