Virus, germs, microbe, bacterium, pathogen organism, leukocyte 3D illustration. viral infections. Immunity fights disease. White blood cells attack infected cells. Viral mutations and immune defense

Virus, germs, microbe, bacterium, pathogen organism, leukocyte 3D illustration. viral infections. Immunity fights disease. White blood cells attack infected cells. Viral mutations and immune defense - 187327573

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