“…Beta haemolytic streptococcal isolates are commonly cultured from respiratory samples and appear to remain highly susceptible to penicillin (Isgren et al, 2021), although a recent Kentucky‐based study identified an increasing temporal trend in penicillin resistance among Streptococcus equi subsp. zooepidemicus isolates (Lord et al, 2022). However, procaine penicillin formulations have longer withdrawal times for racing and competition, and muscle soreness can develop with repeated administration.…”