Two finishing pigs on one commercial farm carried a streptococcus suis infection that resisted 12 of the 18 antimicrobials tested. Gentamicin was the only drug that stayed fully susceptible in both isolates. Tetracycline resistance was part of the same pattern, so the panel and not the farm’s history has to decide which drug is still usable. Why a streptococcus suis infection that resists drugs matters Streptococcus suis is a Gram-positive coccus, and 29 serotypes have been described. It sits in the tonsils and the upper respiratory tract of healthy pigs, so its presence alone tells a herd owner very little. Where it goes and what it brings along are the…