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This 1975 file microscope image made available by the Centers for Disease Control and Prevention shows chlamydia trachomatis bacteria magnified 200 times. (Dr. E. Arum, Dr. N. Jacobs/CDC via AP) **FILE**

This 1975 file microscope image made available by the Centers for Disease Control and Prevention shows chlamydia trachomatis bacteria magnified 200 times. (Dr. E. Arum, Dr. N. Jacobs/CDC via AP) **FILE**

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