There are truly resistant varities like warren but like i said its a short list. Many of us grow many resistant varities but someone like @rayrose will tell you the extremely resistant types we hrow like plumblee die of fireblight. There are different strains of fireblight. The current strain i have is the really bad strain.
Have lost 3 chojuro trees to fireblight but the one i got at starks last time is doing great so far. Noone knows how resistant a pear is until they bloom and fruit. That is when they really get fireblight! We have experiencè growing warren, potomac, ayers, clarks small yellow, farmingdale, hood many many years and we know how resistant they are. Harrow sweet is moderately resistant and slightly more resistant than harrow delight. Maxine is more resistant than most pears in that class. Never had severe die back on maxine yet. There are many people who swear a leadbetter wont get fireblight and in my limited experience with that pear i believe them Arthur Ledbetter Pear – Bass Pecan .I’m not sure most people would like them. Southern pears are very different normally. @coolmantoole could tell you a few of those he has good luck with Southern Pears - #316 by clarkinks . @krismoriah you dont want me to show you what this strain of fireblight does to harrow pears.