Your risk is minimal for a number of reasons which include:
1. Your partner was likely not infected. Oral infections are relatively uncommon, even in commercial sex workers. If she was not infected, you would not be.
2. If she was infected, only a minority of exposures lead to transmission of infection
3. You have no signs or symptoms.
There is no reason to take any antibiotics for this exposure. If you did, cephalexin would be the wrong one. Doxycycline or azithromycin would be preferable. EWH
i have 22 tablets of cephalexin 250mg
should i take these as a precaution. if so, how much?