Infestation and distribution of chigger mites on Brown rat (Rattus norvegicus) in Yunnan Province, Southwest China

@#Chigger mites is a group of arthropods and some of them are vectors of scrub typhus. As a common synanthropic rodent species, the Brown rat (Rattus norvegicus) often harbors lots of ectoparasites including chigger mites. According to some “data mining” strategies, the present study took the advantage of the abundant original data from a long-term field ecological investigation between 2001 and 2015 to make a detailed analysis of chigger mites on R. norvegicus in Yunnan Province, Southwest of China. From 18 of 33 investigated counties, only 1414 chigger mites were collected from 1113 Brown rats with relatively low infestations. The 1414 individual chigger mites were identified as comprising 61 species, 11 genera and 2 subfamilies of the family Trombiculidae with a high species diversity (S=61, H’=3.13). Of 61 mite species, there were four main species, Walchia ewingi, Ascoschoengastia indica, W. koi and A. rattinorvegici, which accounted for 44.41% of the total mites. All the chigger mites were of aggregated distribution among different individuals of R. norvegicus. The Brown rats in the outdoor habitats harbored much more individuals and species of chigger mites with a higher mean abundance (MA=1.46) and mean intensity (MI=12.53) than in the indoor habitats (P<0.05). The overall infestation of the rats was significantly higher in the mountainous landscapes than in the flatland landscapes (P<0.001). The species similarity (Css) of the mites on the male and female rats reached 64.44% with sex biased infestations. The male rats harbored more species and individuals of the mites than the female rats. The adult rats harbored more species and individuals of the mites than the juvenile rats. The species abundance distribution of the mites was successfully fitted by Preston’s lognormal model with S

Diagnostic et traitement de l'acces pernicieux chez l'enfant a l'Hopital de Mbalmayo (Cameroun). [Lettre]

L'acces pernicieux est l'une des principales causes de la mortalite infantile en Afrique Sud-Saharienne. Les statistiques de l'Hopital Departemental de Mbalmayo; d'avril a septembre 1994; ont montre au total 543 consultations parmi lesquelles 441 cas de paludisme; une proportion de 84;9 pour cent. On y comptait 49 cas de neuro-paludisme soit 11 pour cent de la totalite des cas de malaria. L'evolution le plus souvent fatale; exige un diagnostic precoce et rapide en excluant toutes les autres encephalopathies presentes dans cette tranche d'age. Cet article presente donc une analyse faite a l'Hopital Departemental de Mbalmayo concernant le diagnostic et le traitement du neuro-paludisme chez l'enfant