Toxic to humans. Made by the genus Bacillus . Polymyxin, Aerosporein, Subtilin. Tyrocidin and Gramicidin. Polar flagellation - monotrichous.
All bacteria show Brownian movement.
Phase variation - changes in flagellin. Streptococcus pyogenes - strepto throat. Streptococcus mutans - dental caries. Streptococcus salivarius - gingivitis. Gonococci - only certain tissues are infected.