exactly. bingo.
I have had seeds from several sources that came with fungal infections from the beginnning. One was from a home grower, and the appearance of the seeds told me they had been pulled from bud rot. I gave them a try as an experiment because they were from a local heirloom I had been looking for. Those rotted when I tried to germ them, and a fungal bloom appeared in my seed soak.
One time I bought a large stock of seeds gathered on site in the himalayas, and every single one of them damped off. the ones that lasted long enough to get above ground produced a bloom of white mold below the cotyledons.
Both of these could have contaminated the rest of the grow, but I was fortunate that I knew the risks and kept them isolated from the rest of my grow.
This is most problematic example in my opinion… Seeds were widely distributed here a while back that turned out to have come from a mother with a terrible pythiosis infection that caused stem rot and girdling, as well as an unknown viroid causing variegation and leaf necrosis which was transmitted from an infected stardawg cutting in the same grow, and passed on through the seeds. Not knowing these risk factors, I gave the seeds to a friend. The plants displayed heavy variegation which developed into leaf necrosis spreading outward from the spines. it could have really screwed up his med garden, but fortunately he had them in a far corner of his garden in plastic pots with no drainage. The seeds were given away as testers and the person who shared them was aware of the pathogens, but didn’t disclose it until people had started to grow the seeds, and at first only in a thread unrelated to the tester seeds.
I think it pays to be extra cautious with stuff like this. And when it comes to sharing seeds, only share your best work that you know is truly clean and safe for other people’s gardens.