columnaris are opportunists. they feed on flesh on open wounds.
so answer to your question is yes. but its rather unlikely to infect all ur fishes unless ur water condition is that bad and your fishes kept fighting having open wounds.
all the best cool.
try to act fast. im my experience, it can scar a fish if the columnaris eat their way too "in" to the flesh. in worst case i seen so far, columnaris ate away the one of the upper or lower jaw of my friend's fish, leading to the fish no longer able to feed and died soon after that.
and perhaps you could take a clearer and less exposed picture for me to be more sure its columnaris.