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Since the switch to the acellular vaccines of DTaP and Tap, pertussis cases in the US have risen and cyclically fallen. We have observed that mRNA pertussis vaccines are immunogenic and protective in mice. Here, we further evaluated the pertussis toxoid mRNA antigen and refined the formulation based on optimal pertussis toxin neutralization\n              <jats:italic>in vivo<\/jats:italic>\n              . We next evaluated the mRNA pertussis vaccine in Sprague-Dawley rats using an aerosol\n              <jats:italic>B. pertussis<\/jats:italic>\n              challenge model paired with whole-body plethysmography to monitor coughing and respiratory function. Female Sprague-Dawley rats were primed and boosted with either commercially available vaccines (DTaP or wP-DTP), an mRNA-DTP vaccine, or mock-vaccinated. The mRNA-DTP vaccine was immunogenic in rats and induced antigen-specific IgG antibodies comparable to DTaP. Rats were then aerosol challenged with a streptomycin-resistant emerging clinical isolate D420Sm1. Bacterial burden was assessed at days 1 and 9 post-challenge, and the mRNA vaccine reduced burden equal to both DTaP and wP-DTP. Whole-body plethysmography revealed that mRNA-DTP vaccinated rats were well protected against coughing which was comparable to the non-challenged group. These data suggest that an mRNA-DTP vaccine is immunogenic in rats and provides protection against aerosolized\n              <jats:italic>B. pertussis<\/jats:italic>\n              challenge in Sprague-Dawley rats.\n            <\/jats:p>\n          <\/jats:sec>","DOI":"10.1128\/iai.00520-23","type":"journal-article","created":{"date-parts":[[2024,7,17]],"date-time":"2024-07-17T13:01:03Z","timestamp":1721221263000},"update-policy":"https:\/\/doi.org\/10.1128\/asmj-crossmark-policy-page","source":"Crossref","is-referenced-by-count":7,"title":["Immunization with an mRNA DTP vaccine protects against pertussis in rats"],"prefix":"10.1128","volume":"92","author":[{"ORCID":"https:\/\/orcid.org\/0000-0002-9734-6424","authenticated-orcid":false,"given":"Graham J.","family":"Bitzer","sequence":"first","affiliation":[{"name":"Department of Microbiology, Immunology, and Cell Biology, West Virginia University , Morgantown, West Virginia, USA"},{"name":"West Virginia University Vaccine Development 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