I wrote a post earlier about author's section on intestinal parasites. Here is the part about EO:

Page 297, author talks about the use of EO as a fumigant used on dry herbs. As noted by several contributors here, some of the covid testing swabs contain EO and nobody should have that stuck up their nose. I found this part informative and book was published back in 1996. Here is the part author writes about EO: "Pesticides sprayed on plants are not the only concern. Chemicals called fumigants are often used to kill pests on dried herbs, sometimes even plants that have been organically grown. ETHYLENE OXIDE, ethylene bromohydin and ethylene chlorohydrin are commonly sprayed on herbs to destroy bugs and microbes.The safety of the herbs once they are sprayed is the subject of much debate. Most gas companies argue that the gas residues are long gone before the plants reach the consumer. I certainly hope so- thus far, ethylene oxide has been linked to birth defects and spontaneous abortions in hospital workers who used it to sterilize equipment. Ethylene Oxide is also considered a possible carcinogen. The results of one study conducted in Sweden found that the incidence of leukemia in workers exposex to EO was more than 10 times higher than that of the general population. In 1990, 800,000 pounds of this chemical were used in California alone- much of what was released into the air as industrial plant emissions. State officials estimated that this use could result in up to 510 cancers over the next 70 years".

That is from page 297, and I thought how relevant that is for today.