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Biomedical subjects

C Vermeil

Publications and source records attributed to C Vermeil.

At least 19 recordsLinked to original sources
PubMed1996

[Argas and arbovirus update].

At the opportunity of the recent discovery of a new Phlebovirus, Tunis virus, the authors discuss the importance of the genus Argas as for its potential role in the transmission of arboviruses: twelve species of Argas are known to carry about twenty viruses. The wide distribution of Argas reflexes hermanni prompt us to explain its position in the Argas reflexes "complex" group: this species seems to be more liable to infection by viruses. Some ecological and entomological data are added to facilitate its typing. The Tunisian specimens recollected are remarkable by the lack of seta n degree 5 on basis capituli.

Animals↗
PubMed1995

[Tick-transmitted arbovirus in Maghreb].

The problem of arbovirus infections in Maghreb has been relatively neglected in the pst in spite of a rich diversity of biotopes, the presence of potential reservoirs and vectors, and their position on the flight path of the Palearctic-african bird migration systems, western branch. Moreover, West Nile virus has been isolated from southern Algeria since 1968. From 1979 to 1989, ticks were collected from wild birds, pigeons, bats, rodents, poultry, camels, wild boars, domestic mammals and man, and assayed for viruses. On the whole, 424 ticks were virologically studied from Morocco, 582 from Algeria and 601 from Tunisia. Four tick-borne arboviruses have been isolated so far: three from Morocco, Soldado (Nairovirus), Essaouria (Orbivirus) and Kala Iris (Orbivirus) from Ornithodoros (A.) maritimus ticks parasitizing marine birds, and one from Tunisia, Tunis (Phlebovirus), from Argas reflexus hermanni infesting domestic pigeons. Soldado virus may infect man working into colonies of gulls for ornithological or entomological purposes and this infection is associated with a self-limited febrile illness and pruritus. In addition, antibody to Essaouira virus was detected in a wild rodent in Morocco. On the contrary it is unlike that Tunis virus may infect man because A. r. hermanni is a strickly ornithophilic tick. However, Uukuniemi group antibody has been previously evidenced in wild rodents in Tunisia. Finally, it is not excluded that other, more pathogenic, arboviruses such as Congo-Crimean haemorrhagic fever might be accidentally introduced in this sensitive geographical area.

Africa, Northern↗
PubMed1994

Tunis virus: a new Phlebovirus from Argas reflexus hermanni ticks in Tunisia.

A new Phlebovirus provisionally named Tunis virus has been isolated from Argas reflexus hermanni ticks parasitizing domestic pigeons. It is the first isolation of an arbovirus from Tunisia and the fourth tick-borne virus to be isolated from the Moghreb following Soldado, Essaouira and Kala Iris in Morocco. The pathogenic potential of this virus is briefly discussed according to the behaviour of its vector and previous serosurveys in the country.

Animals↗
PubMed1986

[Does Boutonneuse fever in France have equivalents outside the Mediterranean area?].

In western of France, outside of mediterranean spotted fever area, several sera from autochthonous patients were positive for the presence of anti-R. conori antibodies by indirect immunofluorescence test. What is it all about: authentic rickettsiosis or paraspecific seroreactions with other microorganisms? We discuss these hypothesis.

Arachnid Vectors↗
PubMed1983

[Use of scanning electron microscopy coupled with transmission electron microscopy in comparative studies of the relation between Schistosoma mansoni and Salmonella typhimurium].

Relations between Schistosoma mansoni and Salmonella typhimurium are studied in vivo and in vitro using scanning and transmission electron microscopy as complementary methods. Salmonellae adhesion is a specific process materialized in special places of male and mature schistosome tegumental surface. Interactions are marked by bacterial strong fibres creating a network all around Schistosoma where Salmonellae are dividing. Membrane junction is the last stage leading to symbiotic balance between two biologic systems.

Animals↗
PubMed1983

[Babesiasis, pediatric malaria: does confusion exist in Africa?].

The authors describe a case of febrile disease acquired by a nursling in Africa: was it induced by Pl. falciparum or by Babesia sp.? In spite of numerous microscopic and serological appraisals from veterinary and medical authorities, it is difficult to state definitively this subject, but it is more probably a babesiosis of canine or rodent origin.

Animals↗
PubMed1983

[Specificity in the relationship between Salmonella typhimurium and Schistosoma mansoni].

Special interaction between Salmonella typhimurium (STM) and Schistosoma mansoni is considered under two complementary aspects, in vivo and in vitro, using scanning and transmission electron microscopy. The resulting observations have obviously permitted us to discover a large specificity in these adhesion phenomena that seems to lead to the fusion of membranes between the two organisms. Microanalysis trials executed in these areas of strong affinity were attempted.

Animals↗
PubMed1981

[Possible transfer between sarcomatous mouse cells (BP8) and yeasts (Saccharomyces cerevisiae, whole bodies and protoplasts)].

From our observation in vitro, we can suggest that : a direct contact between sarcomatous cells and physiologically active yeasts appears to be necessary for the transfer of the radioactive labelling; the presence of a filter with pores of 1.2 micrometer diameter prevents passage of fragments of DNA or RNA between the cells; this transfer is a very small fact, but implies about the third of the yeasts.

Animals↗
PubMed1980

[New approach to the study of the experimental inhibitory effect of the unicellular alga Chlorella pyrenoidosa against the murine sarcomas BP8 and L1210].

In this paper, the authors are relating the inhibitory effect of the unicellular alga Chlorella (Beijerinck, 1890) pyrenoidosa Zeitler and Lund, against the tumoural rodent strains BP8 and L1210, according to the amount of inoculum. The statistical study of the results allows to the conclusive fact of a real protective effect showed by this microorganism and of a demonstrative relation between the amount of the protective material and the tumoural answers the high amount giving a better inhibitory effect. The workers also insist on the lack of pathogenicity presented by the alga used in this study.

Animals↗
PubMed1978

Modulation of antibody synthesis by an anti-tumour alga.

An unicellular alga, Chlorella pyrenoidosa, which had been reported to protect C3H mice against sarcoma BP8, is shown, when injected in Freund's incomplete adjuvant, to modulate the antibody synthesis induced by immunization with a hapten-carrier complex. C. pyrenoidosa appeared to be able to initiate an antigenic competition between hapten and carrier determinants of the antigen molecule during antibody synthesis, and thus it could be speculated that C. pyrenoidosa modulates the immune response at the macrophage level.

Anaphylaxis↗
PubMed1978

[Observation of Schistosoma mansoni by scanning electron microscopy].

The integumental surface of adult Schistosoma mansoni was studied by scanning electron microscopy (SEM) at 220 to 10,000 magnifications. SEM shows certain basic features such as spines in the oral sucker and the acetabulum which may facilitate rasping and attachment of the parasite to stay in the bloodstream of the definitive host. It seems likely that SEM visualization will be a means for differentiation some species of the genus Schistosoma.

Animals↗
PubMed1977

[Autoradiography of the exchanges that can occur between murine sarcoma cells (BP 8) and yeast cells (Saccharomyces cerevisiae, complete or protoplast)].

We can tell after observing the resulting negative that yeasts are able, in our experimental conditions, to collect a sequence of ADN and of ARN proceeding from the cancerous cells. Then, those yeasts could turn their synthesis towards the production of new materials. If those informed yeasts were introduced into a mouse, they would induce at the level of the immunocompetent cells a specific immunizing antitumoral power.

Animals↗
PubMed1976

[Experimental role of the unicellular algae Prototheca and Chlorella (Chlorellaceae) in anti-cancer immunogenesis (murine BP8 sarcoma)].

Bacteria and Yeasts are able to induce, when inoculated into laboratory rodents, a general stimulation of defences by an immune process. We could estimate that unicellular algae would induce the same phenomenon because the chemical compounds of their walls are related to those of the precedings microorganisms specially to bacteria. Indeed, two Chlorellaceae, Prototheca segbwema and Chlorella pyrenoidosa are respectively protecting 78% and 82% CH3 mice against the sarcoma BP8 grafting.

Animals↗