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Journal of Virology, December 2006, p. 11651-11657, Vol. 80, No. 23
0022-538X/06/$08.00+0     doi:10.1128/JVI.01387-06
Copyright © 2006, American Society for Microbiology. All Rights Reserved.

In Vitro and In Vivo Fitness of Respiratory Syncytial Virus Monoclonal Antibody Escape Mutants{triangledown}

Xiaodong Zhao,1 Enmei Liu,1 Fu-Ping Chen,2 and Wayne M. Sullender2,3*

Children's Hospital, Chongqing University of Medical Sciences, Chongqing 400014, China, and Departments of,1 Pediatrics,2 Microbiology, University of Alabama at Birmingham, Birmingham, Alabama3

Received 2 July 2006/ Accepted 11 September 2006

Respiratory syncytial virus (RSV) is the only infectious disease for which a monoclonal antibody (MAb) is used in humans. Palivizumab (PZ) is a humanized murine MAb to the F protein of RSV. PZ-resistant viruses appear after in vitro and in vivo growth of RSV in the presence of PZ. Fitness for replication could be a determinant of the likelihood of dissemination of resistant viruses. We assessed the fitness of two PZ-resistant viruses (F212 and MP4). F212 grew less well in cell culture than the parent A2 virus and was predicted to be less fit than A2. Equal amounts of F212 and A2 were mixed and passaged in cell culture. F212 disappeared from the viral population, indicating it was less fit than the A2 virus. The MP4 virus grew as well as A2 in culture and in cotton rats. A2/MP4 virus input ratios of 1:1, 10:1, 100:1, and 1,000:1 were compared in competitive replication. For all input ratios except 1,000:1, the MP4 virus became dominant, supplanting the A2 virus. The MP4 virus also dominated the A2 virus during growth in cotton rats. Thus, the mutant MP4 virus was more fit than A2 virus in both in vitro and in vivo competitive replication. Whether this fitness difference was due to the identified nucleotide substitutions in the F gene or to mutations elsewhere in the genome is unknown. Understanding the mechanisms by which mutant virus fitness increased or decreased could prove useful for consideration in attenuated vaccine design efforts.

* Corresponding author. Mailing address: CHB 114, 1600 6th Ave. S, Birmingham, AL 35233. Phone: (205) 996-7898. Fax: (205) 975-6549. E-mail: wsull{at}uab.edu.

{triangledown} Published ahead of print on 27 September 2006.

Journal of Virology, December 2006, p. 11651-11657, Vol. 80, No. 23
0022-538X/06/$08.00+0     doi:10.1128/JVI.01387-06
Copyright © 2006, American Society for Microbiology. All Rights Reserved.



This article has been cited by other articles:

  • Martcheva, M., Bolker, B. M, Holt, R. D (2008). Vaccine-induced pathogen strain replacement: what are the mechanisms?. J R Soc Interface 5: 3-13 [Abstract] [Full Text]  


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