[Discovery and purification of a virus in gland hyperplasia of insects. Study of Merodon equistris F. (Diptera, Syrphidae)].

ADNA virus was purified from the salivary gland affected by a large proliferation in the Diptera Merodon equestris. Structure, nucleic acid as well as development and intracellular cycle of the virus have been characterized.

[An ultrastructural study of the transformation of elementary bodies of Rickettsiella into initial bodies (author's transl)].

An intermediate stage between the elementary and the initial bodies of the Rickettsietta genus is defined as the beginning of an intracellular cycle. It is characterized by several structural changes in the dense elementary body: the cytoplasm becomes less electron-dense; thus, the nucleoid and the ribosomes are visible. The inner layer of the cell-wall becomes progressively clearer and the trilamellar structure of the inner and outer membranes appears distinctly.

[Immunologic comparison between some Wolbachiae and research of antigentic community with other members of the order of Rickettsiales].

The antigenic relationship between some rickettsiae of arthropods, which do not transmit germs pathogenic to vertebrates was investigated by agglutination and immunofluorescence techniques. The comparison of R. melolonthae, R.