While the article Docmartin quotes DOES indicate that the agents listed in his post are available (some even being used by the armed forces) they nevertheless end the article by saying:
SCUBA DIVING AND INFECTIOUS DISEASES. Infectious diseases have had a profound impact on the course of human history and are clearly a major cause of morbidity and mortality throughout the developing world. To be sure, humankind lives in a virtual sea of microorganisms with teeming numbers of bacterial flora, viruses, and fungal spores. Ironically, this flora offers us a protective mechanism from infection, as well as a relationship of mutual tolerance and beneficial symbiosis. DAN is occasionally asked about the risk of divers acquiring disease or infection from the diving environment and shared scuba equipment. While we are aware of unpublished anecdotal reports related to a variety of infections and diving, there is no documented proof that diving equipment has been responsible for bacterial, viral, or fungal infections. Although a theoretical risk exists in the arrangement of the mouthpiece and second-stage of the regulator, the risk is considered exceedingly low.
Divers, like anyone, may be subject to localized inflammatory changes related to mouth care, e.g. Gingivitis. As a portal of entry, these areas of inflammation may increase the risk for developing disease. However, unless one is exposed to a large area of contamination, it would be unusual to acquire disease through the mouth.
For the diver, the advent of water movement across the surface of diving equipment is generally enough to decrease any contamination that may cause infection in the mouth. Nevertheless, a theoretical risk remains and divers are duly cautioned about buddy breathing practices, especially
IOW, they have yet to see fully documented proof that using those particular products is actually warranted.
No offense to anyone; I just hate to see people get intimidated into using elaborate, expensive "precautions" for what may be nothing more than paranoia.