Protection of MP-12-vaccinated rhesus macaques against parenteral and aerosol challenge with virulent Rift Valley fever virus

John C. Morrill, C. J. Peters

Research output: Contribution to journalArticle

34 Scopus citations


To test safety and efficacy of the Rift Valley fever MP-12 (RVF MP-12) vaccine, 9 healthy adult Rhesus macaques, weighing 5-10 kg, were inoculated intramuscularly with 6 × 103 plaque forming units (PFUs) of MP-12 vaccine. The monkeys developed neutralizing antibody responses with no adverse effects other than a transient, low-titer viremia in 3 monkeys. Four vaccinated animals challenged intravenously with 3 × 106 PFUs of virulent Rift Valley fever virus strain ZH-501 (RVFV ZH-501) at 126 days after vaccination were protected against infection. The remaining 5 vaccinated monkeys along with 2 monkeys that had been vaccinated 6 years prior were completely protected against a small particle aerosol challenge of 5 × 105 PFUs of RVFV ZH-501. The mutagen-attenuated RVF MP-12 vaccine was determined to be protective against intravenous and aerosol challenge with virulent RVFV in these macaques, which suggests further development as a vaccine for humans is warranted.

Original languageEnglish (US)
Pages (from-to)229-236
Number of pages8
JournalJournal of Infectious Diseases
Issue number2
StatePublished - Jul 15 2011


ASJC Scopus subject areas

  • Immunology and Allergy
  • Infectious Diseases

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