STD (Sexual 'Transmitted' Diseases) not validated.

This is a passage taken from - "What Really Makes You Ill?: Why Everything You Thought You Knew About Disease Is Wrong" ~ December 24, 2019
by Dawn Lester (Author), David Parker (Author)

https://amzn.to/3zM6fTe

“The original ‘syphilis’ and what is called ‘syphilis’ today are not the same symptom-complex at all.”

A major flaw in the hypothesis that syphilis originated in the New World, is that 15th and 16th century eyewitness accounts do not describe any of the indigenous peoples as being covered in pustules or with their flesh hanging from their faces. The evidence referred to in the discussion about smallpox, reveals that the documented accounts describe the indigenous people as scrupulously clean. As also cited in the smallpox discussion, Dr Stannard refers to incidents
in which the Spanish conquistadors committed rape, but this fails to provide ‘evidence’ that syphilis either originated in the New World or that it is sexually transmitted.

The hypothesis that syphilis was previously unrecognized also fails to provide a clear explanation for its origin, or for the notion that it is sexually transmitted. There is, in fact, no evidence that definitively demonstrates syphilis to be sexually transmissible; it is certainly not caused by a bacterium.

The discussion about leprosy indicated that the label had been used for a variety of skin problems that were usually treated with mercury. However, the dangers of mercury remained unknown and included: blood, bee stings and arsenic.

Another of the early ‘treatments’ for leprosy involved the use of mercury, the dangers of which are described by Dr Carolyn Dean in Death by Modern Medicine, “Mercury is second only to plutonium in toxicity. When it first began to be used, centuries ago, nobody really knew its dangers. Mercury ointment was a treatment for the skin lesions of leprosy, beginning in the 1300’s.”

Dr Hansen’s ‘discovery’ resulted in the method of treatment for the disease to be changed from mercury ointments to penicillin. The current treatment involves multiple antibiotics, as indicated by the March 2019 WHO fact sheet entitled Leprosy, which states that, “Leprosy is curable with multi-drug therapy (MDT).”

I looked up in the literature what the references does "establishment" medicine have to say about STD's.
Well, there are problems and it appears there is overlap in these things. Adding to that, epidemiology, which is not science at all.

https://www.ncbi.nlm.nih.gov/pmc/articles/PMC11018893/