Jim, ethylene oxide gas is used to sterilize surgical instruments that cannot tolerate Autoclaves. Probably not a solution that the typical beekeeper is going to use regardless.
You can contact anyone you want. I am not concerned about it. Or you could just share what you where told last year. Or did you already?
I went to your link and the search function does not find anything on American Foul Brood or American Foulbrood. Did a further search to find the home page for Beltsville Bee Research Laboratory and of the two search links they have on that page one gets a 404 error page the other does not function. Do you have any links that actually lead to information?
I once again did a google search for American Foul Brood and found this from the USDA
Titled: Helping Beekeepers Beat American Foulbrood
Selected quotes from the above.
Since the 1950s, the only treatment approved for use in the United States to prevent AFB has been the antibiotic oxytetracycline (OTC), sold under the brand name “Terramycin.” But there have been several reports over the past few years of loss of effectiveness of OTC.
In addition. Fortunately, ARS scientists at Beltsville, Maryland, have recently shepherded approval by the Food and Drug Administration of a new antibiotic against AFB called “tylosin.”
Note the above is prevention not cure. as to infected hives the article begins with.
"Infected bee colonies must be burned, and that is costly for beekeepers."
Nothing that has not been repeated many times over in this group. So the disease is well known to be infectious and predominant. It is also known to be in both the brood and the honey. It is consistent that member of this group will be warned about AFB in regard to used equipment. yet I seldom see mention of it in buying populated equipment. capturing bees along with comb and honey etc. This renders the concern of used equipment pointless. If AFB can be transferred to existing hive. it must be considered in respect to anything that can transfer it. Otherwise don't bother.