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- W2894899672 abstract "The elimination of smallpox as an endemic disease and the obvious ethical problems with clinical challenge requires the efficacy evaluation of medical countermeasures against smallpox using the FDA Animal Rule. This approach requires the evaluation of antiviral efficacy in an animal model whose infection recapitulates the human disease sufficiently well enough to provide predictive value of countermeasure effectiveness. The narrow host range of variola virus meant that no other animal species was sufficiently susceptible to variola to manifest a disease with predictive value. To address this dilemma, the FDA, after a public forum with virologists in December 2011, suggested the development of two animal models infected with the cognate orthopoxvirus, intradermal infection of rabbits and intranasal infection of mice, to supplement the nonhuman primate models in use. In this manuscript, we describe the development of an intradermal challenge model of New Zealand White rabbits with rabbitpox virus (RPXV) for poxvirus countermeasure evaluation. Lethality of RPXV was demonstrated in both 9 and 16-week old rabbits with an LD50 <10 PFU. The natural history of RPXV infection was documented in both ages of rabbits by monitoring the time to onset of abnormal values in clinical data at a lethal challenge of 300 PFU. All infected animals became viremic, developed a fever, exhibited weight loss, developed secondary lesions, and were euthanized after 7 or 8 days. The 16-week RPXV-infected animals exhibiting similar clinical signs with euthanasia applied about a day later than for 9-week old rabbits. For all animals, the first two unambiguous indicators of infection were detection of viral copies by quantitative polymerase chain reaction and fever at 2 and 3 days following challenge, respectively. These biomarkers provide clinically-relevant trigger(s) for initiating therapy. The major advantage for using 16-week NZW rabbits is that older rabbits were more robust and less subject to stress-induced death allowing more reproducible studies. These studies were conducted with FDA input and suggested changes were incorporated into the protocols. The FDA has encouraged product developers to use this model in evaluating the therapeutic efficacy of products undergoing US regulatory review under the FDA Animal Rule." @default.
- W2894899672 created "2018-10-12" @default.
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- W2894899672 date "2018-10-05" @default.
- W2894899672 modified "2023-09-23" @default.
- W2894899672 title "Rabbitpox in New Zealand White Rabbits: A Therapeutic Model for Evaluation of Poxvirus Medical Countermeasures Under the FDA Animal Rule" @default.
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- W2894899672 doi "https://doi.org/10.3389/fcimb.2018.00356" @default.
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