| evaluation of a commercially available modified-live streptococcus equi subsp equi vaccine in ponies. | objective-to evaluate a commercially available modified-live streptococcus equi subsp equi vaccine for safety and persistence in vaccinated ponies and to detect recombination or reversion events in the vaccine strain. animals-5 ponies that were 1.5 to 8 years old (group 1) and 4 ponies that were 6 months old (group 2). procedures-ponies were vaccinated, with a subsequent booster vaccination 2 to 3 weeks later, and monitored for 50 days. at booster vaccination, an equal amount of a tetracycline-r ... | 2011 | 21801073 |