VDKs only indicate which type of anti-venom to be used ( there are only 5 types) NOT the type of snake, so if a YFWS bite goes bad then they would use brown snake AV, or, as in my case, use tiger AV for a marsh snake bite.
I would like to no more about the BHP bite returning a positive result.
when you say in your case, i assume you mean you were bitten, can i ask what sample they used to test it. we use blood at work but you can use other samples such as urine and the likes, i am uncertain whether any of the above are more accurate.