Electron microscopic investigations on stages of dog piroplasms cultured in vitro: Asian isolates of Babesia gibsoni and strains of B. canis from France and Hungary.

Stages obtained from two Asian Babesia gibsoni-isolates cultured in vitro were studied by means of transmission electron microscopy and compared to strains of B. canis cultured in vitro. While the developmental stages of the latter preserved their shape in culture, many of the initially small stages of the B. gibsoni strains grew considerably and often looked rather similar to B. canis.