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Contagionability of Lesion Serum

How long does the serum from a syphilitic lesion remain contagious?  Suppose an infected person has serum on his hand, touches a doorknob, and then  X  minutes or hours later another person touches the same doorknob?
Or any other surface - toilet flush knob, table, etc.
      I read that syphilis is most often transmitted by direct contact with a lesion - but I'm asking about indirect contact via transfer of the lesion's serum.  I guess the same question is - how long do the spirochytes(?) live when exposed to air?  Thank you.
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Avatar universal
That's the standard answer, but not the answer to my question.  The serum carries the transmission; how long can it do that?
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101028 tn?1419603004
you won't transmit syphilis to others from routine day to day contact like doorknobs etc.

we call it a sexually transmitted infection for good reason - that's the way it's transmitted.

grace
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