[Discovery and purification of a virus in gland hyperplasia of insects. Study of Merodon equistris F. (Diptera, Syrphidae)]. / Mise en évidence et purification d'un virus dans la prolifération monstrueuse glandulaire d'Insectes. Etude sur Merodon equestris F. (Diptè4re, 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)]. / Etude ultrastructurale de la transformation du corps élémentaire en corps initial chez les Rickettsiella.

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. 'preinitial body' is proposed as name of this stage of development.

[Immunologic comparison between some Wolbachiae and research of antigentic community with other members of the order of Rickettsiales]. / Comparaison immunologique de quelques Wolbachiae et recherche de communauté antigénique avec d'autres membres de l'ordre des 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. tipulae, R. cetonidarum, R. grylli and of the rickettsiae of the scorpion Buthus occitanus shows that the Wolbachiae are divided into three serological groups. The insect crystallogen rickettsiae belong to the first group, R. grylli and the scorpion Rickettsia are antigenically distinct (tables I and II). No antigenic relationship was found between these arthropod microorganisms and the following agents of vertebrate rickettsioses and chlamydioses : historical typhus, murine typhus, pustulous fever, Q-fever, epizootic absortion of sheep and psittacosis (tables III and IV). Bacteria of OX2 and OX19 strain of P. vulgaris when mixed with anti-Wolbachiae serums of I, II, III groups, give a negative Weil a Felix reaction. The OXK Proteus are however agglutinated by 4 out of 6 rabbit anti-Rickettsiella serums of the group. This fact calls for a further investigation regarding the comparison of these Rickettsiella with various strains of R. tsutsugamushi.