yes shoe, resistance simply means they put up a fight rather than surrendering at the first threat. Some put up more fight than others. None are bulletproof. The other problem is that this virus mutates so fast that resistance only holds for several years. Many of the early TSWV varieties have already lost the fight. Here is the best scientific article that I have found that is readably by an antique physicist.
http://www.apsnet.org/edcenter...