K103N var den hyppigst sete RT- substitution i virale isolater fra patienter, som oplevede markant reboundfænomen af virus i blodet i løbet af kliniske undersøgelser af efavirenz i kombination med indinavir eller zidovudin + lamivudin.
K103N was the most frequently observed RT substitution in viral isolates from patients who experienced a significant rebound in viral load during clinical studies of efavirenz in combination with indinavir or zidovudine + lamivudine.