Interesting; I thought the stuff cost a fortune. I always wrap and never swallow, but I will have to look into Prep as supplemental protection. I have had a mild stroke and the high blood pressure that caused the stroke has led to some other issues; I will check with my doctor.
During the two years I lived in Thailand, I caught nothing. I spent a lot of time at Babylon and another sauna in the area of Sukhumvit Soi 1.