<p>Prime Minister David Cameron, President Ellen Johnson-Sirleaf of Liberia, Bill Gates and Secretary of State for International Development, pictured at the GAVI Alliance immunisations pledging conference in London, June 13 2011
</p><p>Picture: Ben Fisher/GAVI Alliance
</p><p><em><strong>Terms of use</strong>
</em></p><em>
This image is posted under a &lt;a href="<a rel="nofollow" class="external free" href="https://creativecommons.org/licenses/by/3.0/">https://creativecommons.org/licenses/by/3.0/</a>" rel="nofollow"&gt;Creative Commons - Attribution Licence&lt;/a&gt;, in accordance with the &lt;a href="<a rel="nofollow" class="external free" href="http://www.nationalarchives.gov.uk/doc/open-government-licence/">http://www.nationalarchives.gov.uk/doc/open-government-licence/</a>" rel="nofollow"&gt;Open Government Licence&lt;/a&gt;. You are free to embed, download or otherwise re-use it, as long as you credit the source as 'Ben Fisher/GAVI Alliance'. </em>
<a rel="nofollow" class="external text" href="https://www.flickr.com/people/14214150@N02">DFID - UK Department for International Development</a>
CC BY 2.0
<a href="//commons.wikimedia.org/wiki/Flickr" class="mw-redirect" title="Flickr">Flickr</a>: <a rel="nofollow" class="external text" href="https://www.flickr.com/photos/14214150@N02/5828156191">David Cameron, Ellen Johnson-Sirleaf, Bill Gates and Andrew Mitchell at the GAVI event</a>