helicobacter pylori bacteria 3d render realistic medicine icon for logo transparent pgn. microbiology health human

helicobacter pylori bacteria medicine render realistic icon logo isolated microbiology health human medical infection symbol organism microbe bacterium microscopic stomach micro biology virus disease science esophagitis pyloridis duodenitis microorganisms helical research scientific biological transmission anatomy bacteriology bacterial gastric cancer treatment danger negative magnification pathogen shape transparent png bacillus pgn pgn