I took Tetracycline for over 2 years(every day for a whole year twice). My CDSA test though pretty much confirms leaky gut in my small intestine but found zero pathogenic bacteria or yeast and found adequate good bacteria in me. I wonder if the test is correct. Seems hard to imagine that that amount of a broad spectrum Antibiotic wouldn't do any harm. I also took Doxyxline and Minocycline for a few months.