What I am saying is, don’t save your table potatoes that have sprouted. Don’t plant them. They are a nightshade.
Cerified seed potatoes are seed that has been certified for purity and freedom from disease by the Dept of Agriculture. They are clones.
Some more blight info: https://blogs.cornell.edu/livegpath/gallery/tomato/tomato-late-blight/
All potatoes are from the Nightshade family.