ABSTRACT
Molecular testing sensitivity, which allows for early diagnosis of the 2019 coronavirus disease (COVID-19), could be affected by sample quality, storage, and transportation timeframe to the laboratory, along with bias related to the pre-analytic phase. The present study reports the selection and decontamination of nasopharyngeal samples during COVID-19 management at the Institut Pasteur Côte d'Ivoire. The objective of this work was to organize sample reception management and report a complete picture of sample selection and decontamination in the context of diagnosis activity decentralization. An administrative note creating the selection and decontamination unit of nasopharyngeal samples initiated activities in May 2020. The required human resources and necessary materials were identified and put in place. Daily activity consisted of receiving, sorting, decontaminating, and sending nasopharyngeal samples to different diagnostic laboratories. Nonconformities were recorded monthly. After a six-month period of activities, from a total amount of 11,401 containers received and decontaminated, 174,085 samples were selected. A proportion of 92.0% of these specimens met the diagnostic standards, while 7.0% that were found acceptable showed minor irregularities. Nevertheless, a rate of 1.0% of samples with major abnormalities could not be used for COVID-19 testing and, therefore, were rejected. Additionally, the non-conformity rate was reduced by 2.4% after the first term activity. Sorting and decontamination of nasopharyngeal samples are crucial steps in biosafety optimization for the technical staff and quality improvement of sample care.
ABSTRACT
Abstract Aim of study. To describe the emergence of dengue 3 virus in Côte d'Ivoire during a yellow fever outbreak which occurred in 2008. Materials and methods. Sera from suspected cases of yellow fever as well as contacts of yellow fever confirmed cases and imported dengue fever cases were tested for immunoglobulin M (IgM) antiyellow fever virus and anti-dengue virus (for IgM antibodies to yellow fever and dengue viruses) and by a specific real time RT-PCR (Bio-Rad) for yellow fever virus and dengue virus viral RNA detection. Results. Of the 511 sera from suspected cases of yellow fever tested, 21 (4.1%) were confirmed positive for yellow fever virus antibody, while 33 (7.6%) of the 432 sera tested were positive for dengue virus antibody. Thirteen viremic subjects, one for yellow fever virus and 12 for dengue 3 virus, were detected by RT-PCR. The majority of the confirmed cases of yellow fever (85%) and dengue 3 fever (93%)were adults, and resided in the city of Abidjan and its regions. Conclusion. These results indicate the existence of transmission foci of these arboviruses diseases in CËote d'Ivoire and the essential contribution of molecular tests for their diagnosis
Subject(s)
Arboviruses , Cote d'Ivoire , Disease Outbreaks , Severe Dengue , Yellow FeverABSTRACT
PCR screening of 1,482 murid rodents from 13 genera caught in 18 different localities of Guinea, West Africa, showed Lassa virus infection only in molecularly typed Mastomys natalensis. Distribution of this rodent and relative abundance compared with M. erythroleucus correlates geographically with Lassa virus seroprevalence in humans.
