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Coronavirus electron micrograph

Group of coronavirus particles, negatively stained with phosphotungstic acid (PTA). Some variation in size is seen, but shape is relatively uniform. Magnification 144,000x.

Reproduced with permission from: McIntosh K, Dees JH, Becker WB, et al. Recovery in tracheal organ cultures of novel viruses from patients with respiratory disease. Proc Natl Acad Sci USA. 1967; 57:933. Copyright © 1967 Kenneth McIntosh, MD.

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