Six yo w/ palpable bilat posterior cervical nodes (biggest 1.1 cm-us w/ benign features). cbc normal; cmv igg 186, igm neg. uri in july. is it normal?

Yes: Could just be residual drainage from the URI or allergies. At six, they still have tiny sinuses and ear tubes, so the drainage is poor. Tonsils can also cloud the picture.

Monitoring Centers: Lymphatic system absorbs/carries things too big to go into the arteries/veins like bacteria eaten by white cells/digested food. Lymph nodes "taste" the lymph everywhere for bad stuff like bacteria/viruses/cancers, etc. When it detects a problem, it alerts the immune system and your body reacts. They enlarge in response to the inflammation they create when they react. They shrink when all is well.