Abstract
A rickettsial organism was isolated from the variegated grasshopper, Zonocerus variegatus, collected in Senegal. The organism is tentatively identified as a strain of Rickettsiella grylli. The rickettsiella isolated from naturally infected grasshoppers was used to infect the grasshoppers Melanoplus sanguinipes or M. differentialis and for in vitro propagation of the organism. Electron microscopy of the R. grylli developmental cycle is characterized by short curved rods (elementary bodies), measuring 350–500 nm in length by 200 nm in diameter, bacilliform-shaped intermediate bodies approximately 500–800 nm in length by 300 nm in diameter, and initial bodies measuring 1 μm in diameter. The formation of large crystalline bodies reported for R. grylli was not observed for the strain in this investigation.
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