Antibiotic Allergy - Peru

I was wondering if anyone placed in Peru knows if they accommodate antibiotic allergies? Specifically for Cephalosporins?

Its the only class of drug I am allergic to and my PCMO wants allergy testing tasks done to see if I can tolerate subclasses of it, however, I am not optimistic that I can.

The task form alludes to this type of antibiotic being one of the only one available, but I also have seen other posts of volunteers at different sites serving with multiple antibiotic allergies. So any insight on if you think not tolerating this antibiotic would be an automatic medical denial would be greatly appreciated. Thanks!