bacteria aggregatibacter,

3d actinobacillus aphrophilus aggregatibacter bacteria bacterial bacteriology bacterium biological biology cgi endocarditis gram negative hacek organism haemophilus health healthcare illustration microbiological microbiology microorganism noone nobody pathogen pathogenic proteobacteria actinomycetemcomitans dental plaque tooth bone joint infection gingival fever bite cattle heart valve embolism sheep pigs horse animal