My friend went to Canada on a work permit , as to work in the hotel industry after  returning to India he was tested positive for vdrl and tpha . Means he got syphilis . Although he is asymptomatic. No rash, chancres, fever nothing But he was feeling tired and weak . Having night sweats was not able to sleep . But we thought it might be jetlag. He states that he never got sexually involved there. But he was injured 3 times , once  a  severe burn on his hand which resulted in watery discharge  out of it and once his toe nail got injured  as wood loft fell on his feet and once he fell down and his arm's skin was scratched Also he was working in room service where you even had to pick drug syringes of people too as in canada drugs are common. So my main concern is . Can syphilis transfer non sexually . If yes then how ? And can it transmit to anyone in his family ? What all precautions should be taken. Is it curable ? What is the probability of syphilis to return after getting cured?