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Subject: NEJM -- Poxvirus Dilemmas -- Monkeypox, Smallpox, and Biologic Terrorism
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Monkeypox, Smallpox, and Biologic Terrorism</FONT></B><BR></CENTER>
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<CENTER><H2><FONT FACE=3D"arial, helvetica">=0A=
Poxvirus Dilemmas &#151; Monkeypox, Smallpox, and Biologic Terrorism=0A=
</FONT></H2> </CENTER> -->More=20
than 20 years have passed since the last case of smallpox<SUP> </SUP>was =

confirmed and 18 years since the International Commission<SUP> </SUP>for =
the=20
Certification of Smallpox Eradication of the World Health<SUP>=20
</SUP>Organization (WHO) concluded that the global eradication of<SUP>=20
</SUP>smallpox had been achieved.<A=20
href=3D"http://content.nejm.org/cgi/content/full/339/8/556#R1"><SUP>1</SU=
P></A><SUP>,</SUP><A=20
href=3D"http://content.nejm.org/cgi/content/full/339/8/556#R2"><SUP>2</SU=
P></A>=20
Now, new dilemmas confront the<SUP> </SUP>world. Could recent outbreaks =
of human=20
monkeypox in the Democratic<SUP> </SUP>Republic of the Congo (known as =
Zaire=20
from 1971 to 1997)<A=20
href=3D"http://content.nejm.org/cgi/content/full/339/8/556#R3"><SUP>3</SU=
P></A><SUP>,</SUP><A=20
href=3D"http://content.nejm.org/cgi/content/full/339/8/556#R4"><SUP>4</SU=
P></A><SUP>,</SUP><A=20
href=3D"http://content.nejm.org/cgi/content/full/339/8/556#R5"><SUP>5</SU=
P></A><SUP>=20
</SUP>represent the return of another form of smallpox?<A=20
href=3D"http://content.nejm.org/cgi/content/full/339/8/556#R6"><SUP>6</SU=
P></A>=20
Could variola<SUP> </SUP>(smallpox) virus be used as a weapon of =
biologic=20
terrorism?<SUP> </SUP>And what are the implications of the decision of =
the WHO=20
to<SUP> </SUP>advise the destruction of all isolates of the smallpox =
virus<SUP>=20
</SUP>in June 1999?<A=20
href=3D"http://content.nejm.org/cgi/content/full/339/8/556#R7"><SUP>7</SU=
P></A><SUP>=20
</SUP>
<P><FONT face=3D"arial, helvetica" size=3D+1><STRONG>Monkeypox in=20
Humans</STRONG></FONT>
<P>Recent reports of large outbreaks of possible cases of monkeypox<SUP> =

</SUP>in the Democratic Republic of the Congo have raised questions<SUP> =

</SUP>as to whether monkeypox could sustain itself as an infection<SUP>=20
</SUP>transmitted from human to human, in the same way as smallpox.<A=20
href=3D"http://content.nejm.org/cgi/content/full/339/8/556#R3"><SUP>3</SU=
P></A><SUP>,</SUP><A=20
href=3D"http://content.nejm.org/cgi/content/full/339/8/556#R4"><SUP>4</SU=
P></A><SUP>,</SUP><A=20
href=3D"http://content.nejm.org/cgi/content/full/339/8/556#R5"><SUP>5</SU=
P></A><SUP>=20
</SUP>Smallpox vaccine protects against monkeypox, but no one is =
being<SUP>=20
</SUP>immunized against smallpox anymore. Might monkeypox soon take<SUP> =

</SUP>over the ecologic niche left vacant by smallpox?<A=20
href=3D"http://content.nejm.org/cgi/content/full/339/8/556#R6"><SUP>6</SU=
P></A>=20
The available<SUP> </SUP>data do not support this possibility.<SUP> =
</SUP>
<P>The first case of human monkeypox was identified in 1970, and<SUP>=20
</SUP>through 1979, 55 cases of monkeypox were confirmed by the WHO<SUP> =

</SUP>in forested areas of western and central Africa, of which 44<SUP>=20
</SUP>cases (80 percent) occurred in the Democratic Republic of the<SUP> =

</SUP>Congo.<A=20
href=3D"http://content.nejm.org/cgi/content/full/339/8/556#R8"><SUP>8</SU=
P></A><SUP>,</SUP><A=20
href=3D"http://content.nejm.org/cgi/content/full/339/8/556#R9"><SUP>9</SU=
P></A><SUP>,</SUP><A=20
href=3D"http://content.nejm.org/cgi/content/full/339/8/556#R10"><SUP>10</=
SUP></A>=20
The clinical picture of monkeypox (<A=20
href=3D"http://content.nejm.org/cgi/content/full/339/8/556#F1">Figure =
1</A>)=20
resembles<SUP> </SUP>that of smallpox in Central Africa.<A=20
href=3D"http://content.nejm.org/cgi/content/full/339/8/556#R9"><SUP>9</SU=
P></A><SUP>=20
</SUP>
<P><A name=3DF1><!-- null --></A>
<TABLE cellSpacing=3D0 cellPadding=3D0>
  <TBODY>
  <TR bgColor=3D#e8e8d1>
    <TD>
      <TABLE cellSpacing=3D2 cellPadding=3D2>
        <TBODY>
        <TR bgColor=3D#e8e8d1>
          <TD vAlign=3Dtop align=3Dmiddle bgColor=3D#ffffff><A=20
            =
href=3D"http://content.nejm.org/cgi/content/full/339/8/556/F1"><IMG=20
            height=3D198 alt=3D" " hspace=3D10=20
            =
src=3D"http://content.nejm.org/content/vol339/issue8/images/small/11f1.gi=
f"=20
            width=3D220 vspace=3D5 border=3D2></A><BR><STRONG>View =
larger=20
            version</STRONG> (143K):<BR><NOBR><A=20
            =
href=3D"http://content.nejm.org/cgi/content/full/339/8/556/F1">[in=20
            this window]</A><BR><A=20
            onmouseover=3D"window.status=3D'View figure in a separate =
window'; return true"=20
            onclick=3D"startTarget('F1', 650, 650); =
this.href=3D'/cgi/content-nw/full/339/8/556/F1'"=20
            =
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            target=3DF1>[in a new window]</A><BR>&nbsp;</NOBR> </TD>
          <TD vAlign=3Dtop align=3Dleft><B>Figure 1.</B> Human Monkeypox =
in a=20
            Six-Year-Old Girl in Zaire, Now the Democratic Republic of =
the=20
Congo.
            <P>In the photographs, taken on about the eighth day of =
rash, the=20
            lesions are all in the same vesiculopustular stage and are=20
            concentrated on the extremities, lips, nares, and palms. The =
child=20
            also had cervical and inguinal lymphadenopathy. (Photographs =
by Mark=20
            Szczeniowski.)
            =
<P></P></TD></TR></TBODY></TABLE></TD></TR></TBODY></TABLE>&nbsp;<BR>The =

intensified WHO-sponsored field studies between 1980 and<SUP> </SUP>1986 =

detected an additional 349 cases; virtually all were =
laboratory-confirmed.<SUP>=20
</SUP>The case fatality rate among patients not vaccinated against<SUP>=20
</SUP>smallpox was 11 percent (15 percent for children under five<SUP>=20
</SUP>years of age).<A=20
href=3D"http://content.nejm.org/cgi/content/full/339/8/556#R10"><SUP>10</=
SUP></A>=20
Of patients from the Democratic Republic of<SUP> </SUP>the Congo, 72 =
percent=20
represented primary cases and were presumably<SUP> </SUP>infected from =
an animal=20
source; the others represented spread<SUP> </SUP>to a second, third, =
fourth, and=20
fifth generation of patients.<A=20
href=3D"http://content.nejm.org/cgi/content/full/339/8/556#R10"><SUP>10</=
SUP></A><SUP>,</SUP><A=20
href=3D"http://content.nejm.org/cgi/content/full/339/8/556#R11"><SUP>11</=
SUP></A><SUP>=20
</SUP>Among 431 unvaccinated household contacts, the secondary =
attack<SUP>=20
</SUP>rate was only 9 percent, far lower than the rates of 25 to 40<SUP> =

</SUP>percent seen with smallpox.<A=20
href=3D"http://content.nejm.org/cgi/content/full/339/8/556#R12"><SUP>12</=
SUP></A><SUP>,</SUP><A=20
href=3D"http://content.nejm.org/cgi/content/full/339/8/556#R13"><SUP>13</=
SUP></A><SUP>=20
</SUP>
<P>Computer simulations were carried out to determine the =
likelihood<SUP>=20
</SUP>that human-to-human transmission of monkeypox would continue,<SUP> =

</SUP>assuming that vaccination-induced immunity to smallpox fell<SUP> =
</SUP>to=20
zero and secondary attack rates were at the upper 95 percent<SUP>=20
</SUP>confidence limits of the observed attack rates =97 14 percent<SUP> =
</SUP>for=20
household contacts and 5 percent for nonhousehold contacts.<A=20
href=3D"http://content.nejm.org/cgi/content/full/339/8/556#R10"><SUP>10</=
SUP></A><SUP>,</SUP><A=20
href=3D"http://content.nejm.org/cgi/content/full/339/8/556#R14"><SUP>14</=
SUP></A><SUP>,</SUP><A=20
href=3D"http://content.nejm.org/cgi/content/full/339/8/556#R15"><SUP>15</=
SUP></A><SUP>=20
</SUP>The model forecast that individual outbreaks might last as =
long<SUP>=20
</SUP>as 14 generations of human-to-human transmission before dying<SUP> =

</SUP>out, but that continuing transmission was highly unlikely.<SUP> =
</SUP>
<P>Only 13 cases of monkeypox were reported from 1987 through 1992,<SUP> =

</SUP>and none from 1993 through 1995.<A=20
href=3D"http://content.nejm.org/cgi/content/full/339/8/556#R16"><SUP>16</=
SUP></A>=20
Beginning in February 1996,<SUP> </SUP>monkeypox outbreaks in the =
Democratic=20
Republic of the Congo<SUP> </SUP>were reported, but investigations were =
limited=20
because of civil<SUP> </SUP>disorder.<A=20
href=3D"http://content.nejm.org/cgi/content/full/339/8/556#R3"><SUP>3</SU=
P></A><SUP>,</SUP><A=20
href=3D"http://content.nejm.org/cgi/content/full/339/8/556#R4"><SUP>4</SU=
P></A> A=20
joint team from the WHO and the Democratic Republic<SUP> </SUP>of the =
Congo=20
visited the province of Kasai Oriental and concluded<SUP> </SUP>that 511 =
cases=20
of suspected monkeypox had occurred between February<SUP> </SUP>1996 and =
October=20
1997.<A=20
href=3D"http://content.nejm.org/cgi/content/full/339/8/556#R5"><SUP>5</SU=
P></A><SUP>,</SUP><A=20
href=3D"http://content.nejm.org/cgi/content/full/339/8/556#R16"><SUP>16</=
SUP></A>=20
Laboratory studies have since revealed<SUP> </SUP>that a substantial =
proportion=20
of the suspected cases were actually<SUP> </SUP>cases of varicella; =
hence, the=20
observed high incidence of possible<SUP> </SUP>household transmission =
(42=20
percent) was not surprising. Moreover,<SUP> </SUP>the disease was =
relatively=20
mild, and overall case fatality rates<SUP> </SUP>were about 1 percent. =
On the=20
basis of the available data, one<SUP> </SUP>cannot conclude that =
monkeypox has=20
changed genetically or in<SUP> </SUP>its pathogenesis, severity, or =
propensity=20
for human-to-human<SUP> </SUP>spread. Careful field studies, to provide =
more=20
definitive answers,<SUP> </SUP>are planned by the WHO.<SUP> </SUP>
<P><FONT face=3D"arial, helvetica" size=3D+1><STRONG>Smallpox as a =
Biologic=20
Weapon</STRONG></FONT>
<P>There is increasing concern that biologic weapons might be =
deployed<SUP>=20
</SUP>in warfare or for terrorist purposes. Terrorism has become =
more<SUP>=20
</SUP>dramatic and destructive in recent years.<A=20
href=3D"http://content.nejm.org/cgi/content/full/339/8/556#R17"><SUP>17</=
SUP></A><SUP>,</SUP><A=20
href=3D"http://content.nejm.org/cgi/content/full/339/8/556#R18"><SUP>18</=
SUP></A><SUP>,</SUP><A=20
href=3D"http://content.nejm.org/cgi/content/full/339/8/556#R19"><SUP>19</=
SUP></A><SUP>,</SUP><A=20
href=3D"http://content.nejm.org/cgi/content/full/339/8/556#R20"><SUP>20</=
SUP></A><SUP>,</SUP><A=20
href=3D"http://content.nejm.org/cgi/content/full/339/8/556#R21"><SUP>21</=
SUP></A><SUP>,</SUP><A=20
href=3D"http://content.nejm.org/cgi/content/full/339/8/556#R22"><SUP>22</=
SUP></A>=20
State<SUP> </SUP>sponsorship of terrorism has risen, and there is =
worldwide=20
diffusion<SUP> </SUP>of technology both through the Internet and because =

experts<SUP> </SUP>have left laboratories in Eastern Europe. Until =
recently,=20
smallpox<SUP> </SUP>was considered an unlikely agent of bioterrorism =
because=20
of<SUP> </SUP>the high level of population immunity to the disease, the=20
availability<SUP> </SUP>of a vaccine, and the knowledge that vaccination =
of=20
patients'<SUP> </SUP>immediate contacts could rapidly control =
outbreaks.<SUP>=20
</SUP>
<P>Circumstances have changed. All vaccination against smallpox<SUP>=20
</SUP>ceased after eradication of the disease was affirmed.<A=20
href=3D"http://content.nejm.org/cgi/content/full/339/8/556#R1"><SUP>1</SU=
P></A><SUP>,</SUP><A=20
href=3D"http://content.nejm.org/cgi/content/full/339/8/556#R23"><SUP>23</=
SUP></A>=20
All<SUP> </SUP>countries realized substantial savings, both in the costs =
of<SUP>=20
</SUP>vaccine administration and in vaccination-caused illnesses =
and<SUP>=20
</SUP>deaths that were averted.<A=20
href=3D"http://content.nejm.org/cgi/content/full/339/8/556#R24"><SUP>24</=
SUP></A>=20
Virtually all children and many<SUP> </SUP>adults are now fully =
susceptible to=20
smallpox. Only limited supplies<SUP> </SUP>of vaccine (vaccinia virus) =
are=20
available. The WHO retains about<SUP> </SUP>500,000 doses of vaccinia, =
and 60=20
million to 70 million doses<SUP> </SUP>are retained elsewhere, not all =
of which=20
are properly stored<SUP> </SUP>or monitored regularly for potency. The =
U.S.=20
stocks might be<SUP> </SUP>adequate to vaccinate 5 million to 10 million =

persons. Facilities<SUP> </SUP>for manufacturing smallpox vaccine have =
been=20
converted to other<SUP> </SUP>uses or destroyed. The production of =
vaccine in=20
cell culture<SUP> </SUP>is under study in the United States, but =
large-scale=20
manufacture<SUP> </SUP>is years away. Genetically engineered vaccinia =
strains=20
are being<SUP> </SUP>investigated, mainly as vectors for other =
antigens.<A=20
href=3D"http://content.nejm.org/cgi/content/full/339/8/556#R25"><SUP>25</=
SUP></A><SUP>,</SUP><A=20
href=3D"http://content.nejm.org/cgi/content/full/339/8/556#R26"><SUP>26</=
SUP></A><SUP>=20
</SUP>
<P>Where might smallpox virus be obtained? In 1980, the WHO's =
international<SUP>=20
</SUP>commission recommended that "all institutions maintaining =
stocks<SUP>=20
</SUP>of variola virus destroy or transfer these stocks to WHO=20
collaborating<SUP> </SUP>centers equipped with adequate security" and =
that such=20
laboratories<SUP> </SUP>be visited at least every two years to evaluate =
security=20
and<SUP> </SUP>adherence to WHO safety directives.<A=20
href=3D"http://content.nejm.org/cgi/content/full/339/8/556#R23"><SUP>23</=
SUP></A>=20
Of 76 laboratories identified<SUP> </SUP>as having variola virus by =
1980, 74=20
destroyed their stocks or<SUP> </SUP>transferred them to a WHO =
collaborating=20
laboratory.<A=20
href=3D"http://content.nejm.org/cgi/content/full/339/8/556#R2"><SUP>2</SU=
P></A>=20
Currently<SUP> </SUP>only two laboratories are known to retain variola =
virus:=20
the<SUP> </SUP>Centers for Disease Control and Prevention (CDC) in =
Atlanta,<SUP>=20
</SUP>and the Russian State Research Center of Virology and =
Biotechnology<SUP>=20
</SUP>in Koltsovo, Novosibirsk Region, Russian Federation. Both are<SUP> =

</SUP>WHO collaborating centers and have biosafety-level 4 =
facilities.<SUP>=20
</SUP>
<P>Some speculate that there are additional variola-virus isolates,<SUP> =

</SUP>either long-held unreported stocks or those obtained from a<SUP> =
</SUP>WHO=20
reference center through a lapse in security.<A=20
href=3D"http://content.nejm.org/cgi/content/full/339/8/556#R27"><SUP>27</=
SUP></A><SUP>,</SUP><A=20
href=3D"http://content.nejm.org/cgi/content/full/339/8/556#R28"><SUP>28</=
SUP></A>=20
It has<SUP> </SUP>also been hypothesized that smallpox virus has been=20
recombined<SUP> </SUP>with other dangerous pathogens for use as a =
biologic=20
weapon,<SUP> </SUP>but the accuracy of these scenarios is unknown.<SUP> =
</SUP>
<P>Were smallpox virus released as an act of terrorism, the results<SUP> =

</SUP>could be catastrophic. A large proportion of the population<SUP> =
</SUP>has=20
no immunity. There is little available vaccine and no effective<SUP>=20
</SUP>treatment. The expected case fatality rate would be higher =
than<SUP>=20
</SUP>25 percent. Although there are no simple measures to detect<SUP> =
</SUP>or=20
prevent biologic terrorism with smallpox (or other agents),<A=20
href=3D"http://content.nejm.org/cgi/content/full/339/8/556#R29"><SUP>29</=
SUP></A><SUP>=20
</SUP>four specific actions could diminish this risk.<SUP> </SUP>
<P>First, the WHO should call on all countries to destroy =
immediately<SUP>=20
</SUP>all stocks of variola virus. This would be a clear signal to<SUP>=20
</SUP>any group or nation contemplating the use of the virus that<SUP>=20
</SUP>such action would be the most reprehensible of crimes.<SUP> </SUP>
<P>Second, efforts should be intensified to secure international<SUP>=20
</SUP>agreements enforcing inspection of all suspect facilities =
anywhere<SUP>=20
</SUP>in the world. This would include strengthening the Convention<SUP> =

</SUP>on the Prohibition of the Development, Production and =
Stockpiling<SUP>=20
</SUP>of Bacteriological (Biological) and Toxin Weapons and on =
Their<SUP>=20
</SUP>Destruction.<A=20
href=3D"http://content.nejm.org/cgi/content/full/339/8/556#R30"><SUP>30</=
SUP></A><SUP>=20
</SUP>
<P>Third, the capacity for large-scale manufacture of additional<SUP>=20
</SUP>smallpox vaccine should be developed. Production, with use of<SUP> =

</SUP>WHO-approved vaccinia strains and cell culture, should begin<SUP> =
</SUP>at=20
selected sites and should include the planning of an emergency<SUP>=20
</SUP>vaccine-distribution system.<SUP> </SUP>
<P>Fourth, a plan to cope with an attack with smallpox virus should<SUP> =

</SUP>be developed as part of a national plan to confront the =
release<SUP>=20
</SUP>of biologic agents. Such an initiative was announced recently<SUP> =

</SUP>by President Bill Clinton.<A=20
href=3D"http://content.nejm.org/cgi/content/full/339/8/556#R31"><SUP>31</=
SUP></A>=20
Vaccination should be considered<SUP> </SUP>for persons who would be =
responsible=20
for the investigation and<SUP> </SUP>control of suspected outbreaks of =
smallpox=20
and for patient care.<SUP> </SUP>
<P>Although smallpox virus represents an extremely serious threat,<SUP>=20
</SUP>the same cannot be said for monkeypox. The effect of an =
aerosol<SUP>=20
</SUP>of monkeypox released among humans is difficult to predict,<SUP> =
</SUP>but=20
case fatality rates would probably be below 15 percent,<SUP> =
</SUP>substantially=20
lower than the rate expected among unvaccinated<SUP> </SUP>smallpox =
victims.<A=20
href=3D"http://content.nejm.org/cgi/content/full/339/8/556#R1"><SUP>1</SU=
P></A>=20
Moreover, monkeypox virus is difficult for<SUP> </SUP>humans to acquire=20
naturally and has a limited capacity for spread.<SUP> </SUP>
<P><FONT face=3D"arial, helvetica" size=3D+1><STRONG>Destruction of =
Variola=20
Virus</STRONG></FONT>
<P>At meetings in 1986 and 1990, a WHO expert committee on =
orthopoxvirus<SUP>=20
</SUP>infections affirmed the desirability of destroying stocks of<SUP>=20
</SUP><I>Variola major </I>and<I> V. minor,</I> but recommended =
additional=20
mapping,<SUP> </SUP>cloning, and sequencing studies. By 1994, this work =
was=20
virtually<SUP> </SUP>completed, and the committee recommended the =
destruction=20
of<SUP> </SUP>all stocks of variola virus. This decision was supported =
in<SUP>=20
</SUP>1993 by the Council of the American Society of Microbiology,<SUP>=20
</SUP>the executive board of the International Union of =
Microbiological<SUP>=20
</SUP>Societies, the board of scientific counselors of the National<SUP> =

</SUP>Center for Infectious Diseases of the CDC, the board of =
directors<SUP>=20
</SUP>of the American Type Culture Collection, and the Russian =
Academy<SUP>=20
</SUP>of Medical Sciences.<SUP> </SUP>
<P>There are cogent arguments for both the destruction and the<SUP>=20
</SUP>retention of smallpox virus. Opponents of destruction argue<SUP>=20
</SUP>that the unique host specificity of variola virus is =
justification<SUP>=20
</SUP>for its preservation<A=20
href=3D"http://content.nejm.org/cgi/content/full/339/8/556#R32"><SUP>32</=
SUP></A><SUP>,</SUP><A=20
href=3D"http://content.nejm.org/cgi/content/full/339/8/556#R33"><SUP>33</=
SUP></A><SUP>,</SUP><A=20
href=3D"http://content.nejm.org/cgi/content/full/339/8/556#R34"><SUP>34</=
SUP></A>=20
and that the virulence segment<SUP> </SUP>of the variola-virus genome =
has not=20
been identified. Studies<SUP> </SUP>of variola-virus=96encoded proteins =
that might=20
alter host<SUP> </SUP>immune and regulatory functions have been =
proposed, in the=20
belief<SUP> </SUP>that such studies might improve our understanding of =
human=20
defense<SUP> </SUP>mechanisms and help society cope with new poxviruses =
and=20
other<SUP> </SUP>emerging infections.<SUP> </SUP>
<P>Proponents of destruction argue that the genomes of reference<SUP>=20
</SUP>strains have been cloned and sequenced,<A=20
href=3D"http://content.nejm.org/cgi/content/full/339/8/556#R35"><SUP>35</=
SUP></A><SUP>,</SUP><A=20
href=3D"http://content.nejm.org/cgi/content/full/339/8/556#R36"><SUP>36</=
SUP></A><SUP>,</SUP><A=20
href=3D"http://content.nejm.org/cgi/content/full/339/8/556#R37"><SUP>37</=
SUP></A>=20
through cooperative<SUP> </SUP>efforts of American and Russian =
scientists.<A=20
href=3D"http://content.nejm.org/cgi/content/full/339/8/556#R38"><SUP>38</=
SUP></A><SUP>,</SUP><A=20
href=3D"http://content.nejm.org/cgi/content/full/339/8/556#R39"><SUP>39</=
SUP></A><SUP>,</SUP><A=20
href=3D"http://content.nejm.org/cgi/content/full/339/8/556#R40"><SUP>40</=
SUP></A><SUP>,</SUP><A=20
href=3D"http://content.nejm.org/cgi/content/full/339/8/556#R41"><SUP>41</=
SUP></A><SUP>,</SUP><A=20
href=3D"http://content.nejm.org/cgi/content/full/339/8/556#R42"><SUP>42</=
SUP></A>=20
Moreover,<SUP> </SUP>monkeypox virus has proved a valuable surrogate for =

variola:<SUP> </SUP>its genomic DNA has more than 90 percent homology =
with=20
that<SUP> </SUP>of variola virus. Monkeypox illness in humans and in=20
macaques<SUP> </SUP>closely resembles smallpox in humans, and the =
disease can=20
be<SUP> </SUP>prevented in animals by vaccination. In contrast, there is =
no<SUP>=20
</SUP>satisfactory animal model of smallpox. Work with variola =
virus<SUP>=20
</SUP>must be performed in a biosafety-level 4 laboratory, whereas<SUP>=20
</SUP>studies with monkeypox require less stringent precautions. =
The<SUP>=20
</SUP>views of developing countries where smallpox was formerly =
endemic<SUP>=20
</SUP>must also be weighed, since they contributed the most money<SUP> =
</SUP>and=20
human resources to the eradication of smallpox. These countries<SUP> =
</SUP>have=20
advocated the destruction of variola-virus stocks.<A=20
href=3D"http://content.nejm.org/cgi/content/full/339/8/556#R7"><SUP>7</SU=
P></A><SUP>=20
</SUP>
<P>During 1995, scientists from the Department of Defense and the<SUP>=20
</SUP>Department of Health and Human Services undertook to =
determine<SUP>=20
</SUP>what, if any, studies involving the use of intact variola =
virus<SUP>=20
</SUP>would be critical to public health and national security. It<SUP>=20
</SUP>was decided that if a model of monkeypox infection in =
macaques<SUP>=20
</SUP>proved unsatisfactory, studies would be warranted to find a<SUP>=20
</SUP>technique to grow variola virus in a genetically or =
chemically<SUP>=20
</SUP>altered mammalian host. The macaque monkeypox model indicated<SUP> =

</SUP>that studies of pathogenesis, the protective efficacy of =
vaccines,<SUP>=20
</SUP>and the therapeutic potential of antiviral compounds could be<SUP> =

</SUP>conducted successfully (Jahrling P, U.S. Army Medical =
Research<SUP>=20
</SUP>Institute for Infectious Diseases: personal communication).<SUP> =
</SUP>
<P>Furthermore, 23 antiviral compounds were evaluated in tissue<SUP>=20
</SUP>culture, with comparison of their action against variola, =
monkeypox,<SUP>=20
</SUP>vaccinia, camelpox, and cowpox viruses. Three compounds had<SUP>=20
</SUP>significant antiviral activity against variola virus but only<SUP> =

</SUP>moderate inhibitory activity against the other =
orthopoxviruses.<SUP>=20
</SUP>Cidofovir, its cyclic derivative, and ribavirin are in =
advanced<SUP>=20
</SUP>clinical testing or are approved for other viral infections.<SUP>=20
</SUP>Further studies of these compounds have begun, with use of a<SUP>=20
</SUP>mouse model of cowpox and the macaque monkeypox model =
(Jahrling<SUP>=20
</SUP>P: personal communication). A hypothetical case can be made<SUP> =
</SUP>for=20
the retention of intact variola virus for as yet incompletely<SUP> =
</SUP>defined=20
research that cannot be conducted with monkeypox virus,<SUP> =
</SUP>cloned=20
variola fragments, or sequence data. This possible use<SUP> </SUP>must =
be=20
balanced against the benefits of a global decision to<SUP> </SUP>destroy =
all=20
stocks of the virus.<SUP> </SUP>
<P><FONT face=3D"arial, helvetica" =
size=3D+1><STRONG>Conclusions</STRONG></FONT>
<P>Reports suggesting that monkeypox might replace smallpox as<SUP> =
</SUP>a=20
serious epidemic threat are unsubstantiated, but the threat<SUP> =
</SUP>posed by=20
the possible use of smallpox as a terrorist weapon<SUP> </SUP>is =
genuine.=20
Because of the gravity of this threat, all known<SUP> </SUP>stocks of =
variola=20
virus should be destroyed as soon as possible.<SUP> </SUP>The deliberate =

deployment of this virus must be discouraged<SUP> </SUP>by whatever =
means=20
possible.<SUP> </SUP>
<P><SUP></SUP>
<P><BR>Joel G. Breman, M.D., D.T.P.H. <BR><I>National Institutes of=20
Health</I><BR><I>Bethesda,<SUP> </SUP>MD 20892-2220</I><SUP> </SUP>
<P><BR>D.A. Henderson, M.D., M.P.H. <BR><I>Johns Hopkins University =
School<SUP>=20
</SUP>of Hygiene and Public Health</I><BR><I>Baltimore, MD =
21205-2179</I><SUP>=20
</SUP>
<P><FONT size=3D-1>The views expressed in this article are those of the=20
authors<SUP> </SUP>and do not necessarily reflect the views of the=20
institutions<SUP> </SUP>with which they are associated.<SUP> </SUP>
<P>We are indebted to Joseph J. Esposito, Karin Esteves, Frank<SUP>=20
</SUP>Fenner, David L. Heymann, John W. Huggins, Peter B. Jahrling,<SUP> =

</SUP>Catherine Laughlin, Brian W.J. Mahy, Bernard Moss, and Mark<SUP>=20
</SUP>Szczeniowski for their thoughtful comments on the manuscript.<SUP> =
</SUP>
<P></FONT><FONT size=3D-1></FONT><FONT face=3D"arial, helvetica"=20
size=3D+1><STRONG>References</STRONG></FONT>
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