They may swab the mouth... They may suggest blood work. Blood work would show if there is an infection in the body. xray seems a little over the top. But he is exhibiting symptoms of an RI so in this case it would be better to treat to stop it before progression.Oh so like X-rays, blood tests, and like swabbing his mouth or something shouldn't be needed? I really hope you're right cause all of that sounds expensive and stressful to him.