[d-Tartrate-positive Salmonella paratyphi B (var. java): lysotype of 1200 strains isolated in France (1975-1985)]. / Salmonella paratyphi B d-tartrate positif (var. java): lysotypie de 1200 souches isolées en France (1975-1985).

The 1200 d-tartrate positive (dt+) strains of S. paratyphi B, isolated in France during the period 1975-1985, were studied with the aid of the Felix and Callow phage-typing system and the results were compared with those of the study of 1945 d-tartrate negative (dt-) strains of S. paratyphi B examined by means of the same phage-typing method. 2359 dt+ and dt- strains were typable and could be assigned to 25 recognized phage-types. A great variation in the number of strains of each biovar was observed in some phage-types. The proportion of dt+ strains was very high (more than 80%) in four of the most frequent phage-types: 1 var. 3 (87.5%), 1 var. 4 (88.1%), Battersea (90.4%), Worksop (100%); but this proportion was low or very low in eight other frequent phage-types: 1 (29%), BAOR (21.1%), 3aI var. 1 (6.1%), Beccles (5.1%), 3aI var. 4 (4.8%), Dundee (4.7%), 3aI (2.7%), Taunton (2.1%). No recognized phage-type found in France can be considered to be specific of the variety java of S. paratyphi B, with the exception of the phage-type Workshop of all which 76 strains were dt+. On the other hand, 422 dt+ strains were atypical and 93 other were untypable by phages. Among 211 dt+ strains isolated from frozen foods imported from South East Asia, 81.3% were atypical. Six new atypical phage-types were defined and proposed for inclusion into the phage-typing schema which is commonly used in epidemiological investigations on human and animal infections due to either of the two biovars of S. paratyphi B.

[The antigen H:z66 in 1,000 strains of Salmonella typhi from the Antilles, Central America and South America]. / Recherche de l'antigène H:z66 chez 1,000 souches de Salmonella typhi provenant des Antilles, d'Amérique Centrale et d'Amérique du Sud.

The research of the flagellar antigen H:z66 of Salmonella typhi was performed in 1,000 strains from the West Indies, Central America and South America. A method based on the immobilization of motile strains in soft agar with immune serum anti-H: d was used to detect strains carrying this flagellar antigen. No strains had antigen H:z66 irrespective to their biovar, phage-type, colicinogeny, drug susceptibility and geographical origin. Future investigations are needed for a better knowledge of the worldwide distribution of Salmonella typhi strains carrying antigen H:z66.

[Prevalence of lysotype No. 3 of Salmonella paratyphi A in Peru]. / Prédominance du lysotype No 3 de Salmonella paratyphi A au Pérou.

Sixty-nine S. paratyphi A strains isolated from Peru were studied with the aid of the phage-typing system of Banker. 55 strains (79.7%) showed specific lytic reactions of the phage-type no 3 and 12 strains (17.3%) those of the phage-type no 1; one strain was atypical and another untypable. All of these strains were susceptible to ampicillin, chloramphenicol, streptomycin, tetracycline and trimethoprim. These results are compared with the data of the scientific literature on the worldwide distribution of the S. paratyphi A phage-types.

[Absence of the antigen H:z66 in 2355 strains of Salmonella typhi from Madagascar and several countries of tropical Africa]. / Absence de l'antigène H:z66 chez 2355 souches de Salmonella typhi provenant de Madagascar et de plusieurs pays d'Afrique tropicale.

The presence of the new flagellar antigen H:z66 (Guinée, 1981) was investigated among 2,355 strains of S. typhi isolated from 1981 to 1985 in Madagascar and some countries of tropical Africa: Burundi, Ivory Coast, Gabon, Mauritania, Central African Republic, Rwanda, Senegal, Zaïre. A method based on the immobilization of motile strains in soft agar with immunserum anti-H:d, was used to detect strains carrying antigen H:z66. No African and malagazy strains had antigen H:z66, irrespective to their biovar, phage-type, drug susceptibility and geographical origin. These results were compared with a study of 2,121 indigenous or imported strains of S. typhi isolated in France during the same period. Except 4 strains from patients contaminated in Indonesia, all of them were also devoid of antigen H:z66. Future research is needed for a complete assessment of the geographical distribution of S. typhi antigen H:z66.