Rickettsia-like organism causing disease in a crangonid amphipod from Florida.


A rickettsia-like organism causing high mortality and gross pathology has been found infecting over 40% of a population of the freshwater crustacean, Crangonyx (near) floridanus Bousfield, in Florida. This is the first report of a rickettsia-like organism from a strictly aquatic animal. Morphological and developmental stages of the organisms range in size and shape from small, dense bacilliform cells measuring 150 nm in diameter by 395 nm in length, to large sausage-shaped cells 0.5 by 3 mum.


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