There are couple of suggestions;
1) Your urologist may consider a prostate massage. This secretes fluid from the penis meatus which should be sent for the;
a) Ordinary culture called as pyogenic culture.
b) Mycobacterial culture.
2) A mycobacterial culture from the meatus directly.
These should be able to establish the diagnosis.
Please feel free for your follow up questions.
I would be happy to assist you further, if you need any more information.
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