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Biomedical subjects

C Chastel

Publications and source records attributed to C Chastel.

At least 19 recordsLinked to original sources
PubMed1992

New developments in the molecular epidemiology of adenovirus 8 keratoconjunctivitis.

Four consecutive epidemics of keratoconjunctivitis caused by adenovirus 8 (Ad8) occurred over a 5-year period in Brest, France. A selection of 30 strains isolated during this period was studied by DNA restriction enzyme analysis using nine restriction enzymes. BglI and SacI were the most discriminative enzymes and allowed the recognition of four DNA variants, all different from the prototype strain Trim. Within each of the epidemics, the strains tested could not be distinguished in this analysis. Between strains from different epidemics differences in DNA structure could be detected however. Thus, the Ad8 epidemics of 1983/1984, 1984, 1987, and 1988 appear to have been due to DNA variants Ad8/D7, D8, D9, and D10, respectively. These results demonstrate that the DNA of Ad8 seems to display a considerable variability, comparable to that observed with Ad7 and Ad21. As has been described for Ad7, Ad21 and Ad41, successive DNA variants of Ad8 prevail during one or more years, and are then replaced by other, newly emerging variants sometimes associated with epidemics.

Adenovirus Infections, Human↗
PubMed1992

[Imported malaria in Brest hospitals from 1981 to 1990].

From 1981 to 1990, 96 confirmed hospital cases of imported malaria occurred in Brest. An important increasing of the annual number was observed in 1986. A high proportion of infection was due to Plasmodium falciparum, mainly from black Africa. Most of the patients was French young men, without or with inadequate chemoprophylaxis. Every case of malaria due to P. falciparum appeared during the 2 months following their return from an endemic area. Two patients had a clinical profile of visceral evolutive malaria and 5 a cerebral malaria. Three patients died.

Adult↗
PubMed1992

[Spiroplasma from Tabanidae capable to multiply and to persist in the central nervous system in mice].

Using alternate passages of cultivation in vitro at 37 degrees C and in suckling mice following intracerebral inoculation, a tabanid spiroplasma was demonstrated capable of multiplication and persistence in mice for 6 successive passages, without production of specific antibody. This is the first report of a spiroplasma from a common flying haematophagous arthropod shown to produce persistent infection of a mammal.

Animals↗
PubMed1991

Multiplication and persistence of Spiroplasma melliferum strain A56 in experimentally infected suckling mice.

Strain A56 of the bee pathogen Spiroplasma melliferum was isolated from a honeybee (Apis mellifera) during ecological studies on mosquito spiroplasmas in Savoie (France). When inoculated intracerebrally (i.c.) into 48-h old suckling mice, this strain was found to replicate to very high titres and to persist in brain for up to 9 months in one individual. We attempted to increase the "neurotropism" of A56 by sequential i.c. passages. During the first two passages, multiplication of the organisms was observed at very high titres in suckling mouse brain (10(7) to 10(11) CCU/ml) generally without the appearance of antibody, thus mimicking the so-called "immunological tolerance" phenomenon. Intracerebral multiplication of A56 decreased during the third passage (10(2) to 10(4) CCU/ml) and ceased during the fourth passage. Spiroplasma multiplication in brain was apparently well tolerated, since brain lesions were minimal and clinical symptoms were limited to a clear, but only rarely significant, delay in growth curves of inoculated versus non-inoculated mice. Progressive spongiform encephalopathy was never observed. Strain A56 S. melliferum appears as the second spiroplasma, after the tick-derived Spiroplasma mirum capable of multiplying in both invertebrate and vertebrate hosts.

Animals↗
PubMed1991

Pathogenicity of Spiroplasma taiwanense for larval Aedes aegypti mosquitoes.

Helical replicative forms, but not the persistent non-replicative forms, of Spiroplasma taiwanense Abalain-Colloc et al. (isolated from the mosquito Anopheles sinensis Wiedemann in Taiwan) were shown to reduce significantly the survival of Aedes aegypti (L.) mosquito larvae reared in 10 ml of water with 0.3 ml of S.taiwanense suspensions added on days 0 and 3. The suspensions contained, respectively, helical forms at a concentration of 10(9) Colour Change Units (CCU)/ml and persistent forms at 10(6) CCU/ml. It is suggested that S.taiwanense, or toxins produced from it, are potentially useful for use in integrated mosquito control programmes.

Aedes↗
PubMed1991

Use of collagen shields in the treatment of herpetic keratitis.

Eighteen patients with typical Herpes simplex virus dendritic keratitis confirmed by viral isolation were treated with corneal collagen shields presoaked with trifluorothymidine for 15 minutes and trifluorothymidine eye drops 5 times daily. The average healing time was 2.9 days (range 1-7 days). No allergic reactions were observed. Toxic punctate keratitis occurred in 3 eyes. The results of this open study suggest that the effect of collagen corneal shields in conjunction with trifluorothymidine shortens the average epithelial healing time compared with other studies that have used antiviral drugs alone.

Adult↗