Dear Doctor,
Please advise
On 12 December 2019 my friend had unprotected oral sex (deep lip smooch, next morning he feeling a very light swelling, breast sucking, 1 or 2 drop liquid may came in mouth but not sure about that as he didn't feel that and got blow job, she licked his penis for around 3 to 4 minute) and protected vaginal sex with a female sex worker.
Around after 4 months of exposure
Dated on
9 April 2020
HIV screening test result is negative
12 April 2020 western blot test is non reactive.
Does he need further test or same is conclusive?