Infections with a predominantly sexual mode of transmission (A50-A64)
A51: Early syphilis
A51.0: Primary genital syphilis
A51.1: Primary anal syphilis
A51.2: Primary syphilis of other sites
A51.3: Secondary syphilis of skin and mucous membranes
A51.4: Other secondary syphilis
A51.5: Early syphilis, latent
A51.9: Early syphilis, unspecified
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