viruses causing infectious diseases decreased immunity concept viral disease virus abstract background cell |
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| navigate by keyword : acid acidophile acidophilic bacillus background bacteria bacterial bacteriology bacterium biological biology bulgaricus cell cheese colony delbrueckii disease epidemic fermentation flora gram grampositive health human illness illustration infection intestine lactic lactobacillus medical medicine microbe microbiological microbiology microorganism microscope microscopic normal rabies research rodshaped salmonella science scientific sickness virus yoghurt |
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| Viruses causing infectious diseases, decreased immunity. Concept of viral disease. Virus abstract background. Cell infect organism. Abstract pathogenic bacteria, rabies virus, 3d illustration |
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