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Attenuated temperature-sensitive respiratory syncytial virus mutants generated by cold adaptation
V B Randolph1, M Kandis, P Stemler-Higgins
1Lederle-Praxis Biologicals, Pearl River, NY 10965.
Virus Research
|September 1, 1994
Summary
Researchers developed cold-adapted respiratory syncytial virus (RSV) vaccine candidates. These attenuated RSV mutants show promise for protecting against RSV infection, with some eliciting strong antibody responses and protection in animal models.
Area of Science:
- Virology
- Vaccinology
Background:
- Respiratory syncytial virus (RSV) is a major cause of respiratory illness in infants and young children.
- Development of effective and safe RSV vaccines is a public health priority.
Purpose of the Study:
- To generate and characterize cold-adapted (CA) temperature-sensitive (TS) mutants of RSV subgroup A and B.
- To evaluate the potential of these RSV mutants as vaccine candidates.
Main Methods:
- Cold adaptation of RSV strains 2B and 3A by prolonged passaging in Vero cells at low temperatures.
- Selection and characterization of temperature-sensitive (TS) mutants.
- Assessment of viral attenuation and immunogenicity in cotton rat models.
Main Results:
- Successful cold adaptation was strain-dependent and time-dependent.
- Seven TS mutants (4 RSV 2B, 3 RSV 3A) were isolated, retaining key viral properties.
- RSV 2B mutants were highly attenuated in cotton rats, with two mutants inducing protective immunity.
- RSV 3A mutants were immunogenic and provided complete protection in cotton rats.
Conclusions:
- Cold-adapted, temperature-sensitive RSV mutants were successfully generated.
- These mutants exhibit varying degrees of attenuation and immunogenicity.
- Selected RSV mutants represent promising candidates for live-attenuated RSV vaccines.