There are many causes of enlarged lymph
nodes, one of them is pulmonary TB.mantoux test
is used to see if there was any exposure of your body to TB bacteria antigens !!!
Mantoux test is unable to differentiate between ongoing TB infection and old TB infection, thats why its not reliable alone, its much reliable if its read along with clinical history like enlarged lymph nodes or chronic coughing etc.
You should rather do more sensitive PCR TB , it is a highly sensitive and specific method for the detection of target genes including those of Mycobacterium tuberculosis
(the bacteria causing tuberculosis
hope my info helped you
Dr Hari Om Chandrakar