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"Many vaccines in the animal industry are developed by modifying a virulent live virus," said Professor Mary Poss
However, vaccinated birds can shed the vaccine virus to infect other birds, and live virus vaccines do not always protect birds from infection from other viral strains
Poss and her Penn State colleagues Yee Ling Chong, graduate student in biology; Abinash Padhi, post-doctoral fellow and Peter J. Hudson, Willaman professor of biology found that one vaccine strain recombined -- exchanged genetic material -- with at least three wild strains, creating new viruses. This raises conce