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Pseudomonas aeruginosa on blood agar. Note the metallic sheen and ground glass appearance. Depending on who you are it can smell like grapes, new shoes, or dirt. To me it smells like new shoes. One of the friendlier smells in the micro lab.


"Pseudomonas aeruginosa is cultured in biofilms in the respiratory tract of patients with cystic fibrosis. Ultimately, lung infection by P. aeruginosa can lead to death." Image Source: Science Photo Library.