happy face of azorhizobium caulinodans in black graduation hat for the ceremony

alumnus anthracis azorhizobium bacilli bacillus bacteria bacterial bacterium cartoon caulinodans character cholera cocci collection cute disease education emoticon emotion endospores expire expression finish food funny gonorrhea graduate graduation happy helicobacter human illustration infection mascot meningitis microbe peritonitis pneumonia poisoning salmonella salmonellosis smart smile streptococci student typhi vector