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<div about="/news-events/nih-research-matters/vaccine-protects-animals-against-anthrax-plague" typeof="sioc:Item foaf:Document" class="ds-1col node node--nih-research-matters view-mode-full node--full node--nih-research-matters--full clearfix">
<p class="publishdate"><span property="dc:date" datatype="xsd:dateTime" content="2018-10-30T00:00:00-04:00" class="date-display-single">October 30, 2018</span></p><div class='syndicate'><h1>Vaccine protects animals against anthrax and plague </h1><div class="callout callout-with-border"><h3>At a Glance</h3>
<ul>
<li>Researchers engineered a vaccine that protects animals from both anthrax and plague.</li>
<li>After more development and testing, the approach could be used to protect people from these and other diseases that pose a public health threat.</li>
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<picture title="Antigens on T4 phage capsid">
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<source srcset="https://www.nih.gov/sites/default/files/styles/floated_media_breakpoint-tiny/public/news-events/research-matters/2018/20181025-T4.jpg?itok=4c3Cx6Z_&amp;timestamp=1540910908 1x" media="screen and (min-width: 0)" />
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</picture><span class="caption">Illustration of antigen molecules (blue) fused onto the head of a T4 phage (a type of virus).</span><span class="credit">Tao et al., mBio</span></div>
</div><p>Certain microbes pose a risk to national security because a terrorist could release them to infect and sicken the public. The bacterium that causes anthrax (<em>Bacillus anthracis</em>) is the one most likely to be used in a bioterror attack. In 2001, five of 22 people died after becoming infected by anthrax spores delivered in letters. Another high-risk microbe and proven biothreat agent is the one that causes plague (<em>Yersinia pestis</em>). Anthrax or plague can cause death within several days if theyre not treated right away with antibiotics.</p>
<p>NIH-supported scientists are developing vaccines to help prepare for bioterror attacks. A vaccine teaches the immune system to recognize and neutralize a bacterium or virus. “Subunit vaccines” use only a part of the microbe to stimulate the immune system. Including only an immune-stimulating subunit, known as an antigen, lowers the chance of unwanted side effects.</p>
<p>A research team led by Dr. Venigalla B. Rao of Catholic University and Dr. Ashok K. Chopra of the University of Texas Medical Branch set out to develop a subunit vaccine to protect against anthrax and plague. Drs. Stephen Leppla and Mahtab Moayeri of NIHs National Institute of Allergy and Infectious Diseases (NIAID) also contributed to the project. The work was supported by NIAID and published in <em>mBio</em> on October 16, 2018.</p>
<p>The scientists fused anthrax and plague antigens to the head, or capsid, of particles of a virus called phage T4. The many antigens on the head of the phage resembled the repeating patterns on a natural virus. Then they tested whether the immune system of lab animals would interact with the antigen-bearing phage T4 vaccine. They injected the vaccine into mice and followed up with a booster shot on day 21. Control mice received injections of phage T4 without antigen.</p>
<p>Blood tests showed that immunized mice made protective molecules called antibodies against the antigens. The research team then exposed the mice to anthrax lethal toxin (LeTx) and plague bacteria. All control mice died within 2 to 4 days, but most of the immunized mice were protected. Of 10 mice exposed first to LeTx and then to plague, eight survived. Of eight mice exposed to both at once, seven survived. The surviving immunized mice cleared infection within 3 days.</p>
<p>The researchers also tested the vaccine with rats. The immunized rats formed antibodies to anthrax and plague antigens, but the control rats did not. At week six, the rats were exposed to LeTx and plague bacteria. All six immunized rats survived, while control rats did not.</p>
<p>Next, the researchers tested the vaccine with rabbits. Two weeks after the booster shot, 10 immunized rabbits received a lethal dose of anthrax spores through a mask covering their nose and mouth. All the immunized rabbits formed neutralizing antibodies and were protected while control rabbits died within 2 to 4 days.</p>
<p>These findings suggest that the phage T4 platform has potential for human vaccine development. Multiple antigens can be fused to the phage T4 platform and confer protection against one or more diseases at once.</p>
<p>“In the future, this vaccine platform could provide a convenient way of mass vaccination against several pathogens,” Rao says.</p>
<p>—by Geri Piazza</p></div><h2 class="label-above">Related Links</h2><ul class="spaced print-urls"><li><a href="https://www.nih.gov/news-events/nih-research-matters/engineered-antibody-protects-monkeys-hiv-virus" target="_top">Engineered Antibody Protects Monkeys From HIV-Like Virus</a></li><li><a href="https://newsinhealth.nih.gov/2016/07/safeguarding-our-health" target="_top">Safeguarding Our Health: Vaccines Protect Us All</a></li><li><a href="https://www.niaid.nih.gov/research/vaccine-types" target="_top">Vaccine Types</a></li><li><a href="https://www.niaid.nih.gov/diseases-conditions/plague" target="_top">Plague</a></li><li><a href="https://emergency.cdc.gov/agent/agentlist-category.asp" target="_top">Bioterrorism Agents/Diseases</a></li><li><a href="https://www.cdc.gov/anthrax/index.html" target="_top">Anthrax</a></li><li><a href="https://www.cdc.gov/plague/index.html" target="_top">Plague</a></li></ul><p class="footnote"><strong class="label-inline">References:&nbsp;</strong><a href="https://www.ncbi.nlm.nih.gov/pubmed/30327445">A Bacteriophage T4 Nanoparticle-Based Dual Vaccine against Anthrax and Plague</a>. Tao P, Mahalingam M, Zhu J, Moayeri M, Sha J, Lawrence WS, Leppla SH, Chopra AK, Rao VB. <em>MBio.</em> 2018 Oct 16;9(5). pii: e01926-18. doi: 10.1128/mBio.01926-18. PMID: 30327445.</p><p class="footnote"><strong class="label-inline">Funding:&nbsp;</strong>NIHs National Institute of Allergy and Infectious Diseases (NIAID).</p>
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