After my risky exposure with CSW my HIV RNA PCR at 9 days not detected and 32 & 85 after HIV test wit CMIA method Non reactive i.e index value is 0.07 and 0.09 after 212 days my HIV 1 and 2 test with elisa method negative i.e index value is 0.24, and hepatatis B and C negative. my problem is enlarged lymph node 32 days after the exposed 1.5 cm length still existing. the lymph node related to any STD ? can i take which type STD test? my tests all are laboratory based tests it is rule out HIV?