https://t.co/Y23mYtd5Dt African Horse Sickness Caused by Genome Reassortment and Reversion to Virulence of Live, Attenuated Vaccine Viruses, South Africa, 2004–2014 https://t.co/cGilIhBtV6
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RT @vaxchoiceeast: Vaccine strain viruses can revert back to more virulent strains and have been killing horses https://t.co/2Qj4mOgSMG htt…
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RT @vaxchoiceeast: Vaccine strain viruses can revert back to more virulent strains and have been killing horses https://t.co/2Qj4mOgSMG htt…
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RT @vaxchoiceeast: Vaccine strain viruses can revert back to more virulent strains and have been killing horses https://t.co/2Qj4mOgSMG htt…