Characterization of the Candiru antigenic complex (Bunyaviridae: Phlebovirus), a highly diverse and reassorting group of viruses affecting humans in tropical America.

The genus Phlebovirus of the family Bunyaviridae consists of approximately 70 named viruses, currently assigned to nine serocomplexes (species) based on antigenic similarities. Sixteen other named viruses that show little serologic relationship to the nine recognized groups are also classified as tentative species in the genus. In an effort to develop a more precise classification system for phleboviruses, we are attempting to sequence most of the named viruses in the genus with the goal of clarifying their phylogenetic relationships. In this report, we describe the serologic and phylogenetic relationships of 13 viruses that were found to be members of the Candiru serocomplex; 6 of them cause disease in humans. Analysis of full genome sequences revealed branching inconsistencies that suggest five reassortment events, all involving the M segment, and thus appear to be natural reassortants. This high rate of reassortment illustrates the inaccuracy of a classification system based solely on antigenic relationships.

Frequency and pattern of intrauterine hysteroscopic lesions among women coming for IVF in the city of Yaoundé

Background: Hysteroscopy is an essential tool to make intrauterine assessment in infertile patients. Diagnosis and appropriate correction of intrauterine anomalies are considered essential in order to increase chances of conception. Ourobjective was to determine the frequency and pattern of intra uterine anomalies identified among women attending hysteroscopy at the Gynaecological Endoscopic Surgery and Human Reproduction Teaching Hospital Paul et Chantal Biya ­Yaoundé (GESHRTH). Methodsand results.Thiswas a cross sectional retrospective study of 96 women attending diagnostic or operative hysteroscopy at the GESHRTH between January 2020 and December 2021.The mean age was 38.7 ±7.6 years. Fifty-nine (61.5%) of the patients were nulliparous. Primary and secondary infertility were found respectively in fifty-two patients (54.2%) and forty-four patients (45.4%). Eleven patients (11.5%) were post-menopausal. Concerning previous surgery, 29 patients (30.2%) have had a myomectomy, 28 patients (29.1%) curettage,16 patients (16.6%) laparoscopy, eight (8.3%) hysteroscopy and one (1%) caesarean section. In all, 92 patients (95.8%) had abnormal intra uterine findings consisting of endometrial polyps (43.7%), sub-mucosal fibroids (42.7%), uterine cavity adhesions (20.8%), endometrial atrophy (4.1%), foetal bone (2%), uterine septum (1%) and non-absorbable suture thread (1%).Conclusion: Abnormal uterine findings were identified in 95.8% of patients attending hysteroscopy at GESHRTH. Most frequent findings were polypsin 43.7%, sub-mucosal fibroids in 42.7% and synechiae in 20.8%. The overall per operatory complication rate was 6.2%.

Introduction. Le recours à l'hystéroscopie constitue une étape indispensable au bilan cavitaire des patientes infertiles. Le diagnostic et la prise en charge adéquate des lésions intra cavitaires permettent d'améliorer les chances de conception.L'objectif de cette étude était de déterminer la fréquence et les caractéristiques des anomalies intra cavitaires chez les patientes opérées d'une hystéroscopie au Centre Hospitalier de Recherche et d'Application en Chirurgie Endoscopique et Reproduction Humaine Paul et Chantal Biya ­Yaoundé (CHRACERH).Méthodes et résultats. Nous avons mené une étude descriptive transversale de Janvier 2020 à Décembre 2021 et recruté 96 patientes. L'âge moyen était de38,7 ±7,6 ans. Soixante-neuf patientes (61,5%) étaient nullipares. Cinquante-deux (54,2%) et quarante-quatre (45,5%) présentaient une infertilité primaire et secondaire respectivement. Onze patientes (11,5%) étaient ménopausées. Concernant les antécédents chirurgicaux,nous avons identifié une myomectomie chez 29 patientes (30,2%), un curetage utérin chez 28 (29,1%), une cœlioscopie chez 16 (16,6%), une hystéroscopie chez huit (8,3%) et une césarienne chez une (1%). Au total, 92 (95,8%) des patientes avaient des anomalies cavitaires objectivées. Il s'agissait de polypes endométriaux (43,7%), fibromes sous-muqueux (42,7%), synéchies utérines (20,8%), atrophie de l'endomètre (4,1%), métaplasie osseuse (2%), cloison utérine (1%) et corps étranger à type de fil de suture nonrésorbable (1%).Conclusion.Les anomalies intra-cavitaires étaient retrouvées chez 95,8% des patientes réalisant une hystéroscopie au CHRACERH. Les anomalies les plus représentées étaient les polypes endométriaux (43,7%), les fibromes sous-muqueux (42,7%) et les synéchies utérines (20,8%). Le taux global de complications opératoires était de 6,2%.

Induction of Toll-like receptor 3-mediated immunity during gestation inhibits cortical neurogenesis and causes behavioral disturbances.

Maternal infection during pregnancy with a wide range of RNA and DNA viruses is associated with increased risk for schizophrenia and autism in their offspring. A common feature in these exposures is that virus replication induces innate immunity through interaction with Toll-like receptors (TLRs). We employed a mouse model wherein pregnant mice were exposed to polyinosinic-polycytidylic acid [poly(I ⋅ C)], a synthetic, double-stranded RNA molecular mimic of replicating virus. Poly(I ⋅ C) inhibited embryonic neuronal stem cell replication and population of the superficial layers of the neocortex by neurons. Poly(I ⋅ C) also led to impaired neonatal locomotor development and abnormal sensorimotor gating responses in adult offspring. Using Toll-like receptor 3 (TLR3)-deficient mice, we established that these effects were dependent on TLR3. Inhibition of stem cell proliferation was also abrogated by pretreatment with the nonsteroidal anti-inflammatory drug (NSAID) carprofen, a cyclooxygenase (COX) inhibitor. Our findings provide insights into mechanisms by which maternal infection can induce subtle neuropathology and behavioral dysfunction, and they may suggest strategies for reducing the risk of neuropsychiatric disorders subsequent to prenatal exposures to pathogens and other triggers of innate immunity.