Previous Article Next Article Table of Contents Science, Vol.337, No.6091, 188-188, 2012 DOI10.1126/science.1217134 Export Citation Attenuated Vaccines Can Recombine to Form Virulent Field Viruses Lee SW, Markham PF, Coppo MJC, Legione AR, Markham JF, Noormohammadi AH, Browning GF, Ficorilli N, Hartley CA, Devlin JM Please enable JavaScript to view the comments powered by Disqus.