<s>[INST] Hello my 1 year old son has primary complex and lymph nodes on lungs, that was the result of x-ray. He also experience high fever and also rashes showing in his skin. What does that mean? I mean what is primary complex and lymph nodes on lungs and why does he experience high fever? Thank you [/INST] HelloPrimary complex term is related to pulmonary Koch(tuberculosis). Primary complex with enlarged lymph node may indicate primary pulmonary tuberculosis. Primary complex of tuberculosis consists of local reaction in the parenchymal of lung where organisms lodge and inflammatory reaction of the associated lymph nodes. Your sons clinical findings may also indicate about Koch infection. He may need few more tests like manitou test’T. B gold test or PCR test for confirmation. He may need tubercular medicines. Get well soon. Take Care Chat Doctor.  </s>