Vaccins et traitements de la pandémie à Coronavirus SARS-CoV-2 : évidences scientifiques, dangers et essais cliniques: Vaccines and treatments for the Coronavirus SARS-CoV-2 pandemic: scientific evidence, dangers, and clinical trials

Since December 2019, an emerging disease due to Severe Acute Respiratory Syndrome coronavirus 2 (SARS-CoV-2) and called coronavirus (COVID-19), has spread quickly around the world from Wuhan, China; leading to an ever-increasing number of confirmed cases and deaths. Unfortunately, to date no drug or vaccine has yet been approved or recommended universally; current therapies are essentially supportive or compassionate. Several options are being considered or under study, including vaccines, antibiotics (azithromycin), antiviral agents (lopinavir, ritonavir, ribavirin, arbidol), anti-parasitic agents (chloroquin, hydroxychloroquin, ivermectin), immunomodulators and other molecules of the immune system (tocilizumab, interferons) and traditional medicine plants. Depuis décembre 2019, une maladie émergente à coronavirus SARS-CoV-2 (Severe Acute Respiratory Syndrome coronavirus 2 (SARS-CoV) appelée coronavirus disease 2019 (COVID-19) s’est rapidement propagée dans le monde entier à partir de Wuhan en Chine, entrainant un nombre toujours plus élevé de cas confirmés et des décès. Malheureusement, à ce jour aucun médicament ou vaccin n’a encore été approuvé ou recommandé universellement, les thérapeutiques actuelles sont essentiellement de soutien ou compassionnelles. Plusieurs options sont envisagées ou en étude comprenant les vaccins, les antibiotiques (azithromycine), les agents antiviraux (lopinavir, ritonavir, Ribavirin, Arbidol), antiparasitaires (chloroquine, hydroxychloroquine, ivermectine), les immunomodulateurs et autres molécules du système immunitaire (Tocilizumab, interférons), les plantes de la médecine traditionnelle. &nbsp

Antimalarial efficacy of a quantified extract of nauclea pobeguinii stem bark in human adult volunteers with diagnosed uncomplicated falciparum malaria. Part 2: A clinical phase IIB trial

According to the promising results of the Phase I and Phase IIA clinical trials with the herbal medicinal product PR 259 CT1 consisting of an 80 % ethanolic extract of the stem bark of Nauclea pobeguinii containing 5.6 % strictosamide, a Phase IIB study was conducted as a single blind prospective trial in 65 patients with proven Plasmodium falciparum malaria to evaluate the effectiveness and safety of this herbal drug. The study was carried out simultaneously using an artesunate-amodiaquine combination (Coarsucam®) as a positive control. This combination is the standard first-line treatment for uncomplicated malaria recommended by the National Programme of Malaria Control in the Democratic Republic of Congo (DR Congo). With regard to PR 259 CT1, patients were treated with a drug regimen of two 500-mg capsules three times daily for three days in the inpatient clinic, followed by out-patient treatment of one 500-mg capsule three times daily during the next four days; the positive control group received two tablets containing 100 mg artesunate and 270 mg amodiaquine (fixed-dose) once daily during three consecutive days. Antimalarial responses were evaluated according to the WHO 2003 guideline for a 14-day test. The results from the physical and laboratory examinations did not show any significant changes in values of vital signs, ECG, biochemical, and haematological parameters. The study showed a significant decreased parasitaemia in patients treated with PR 29 CT1 and artesunate-amodiaquine with adequate clinical parasitological responses (APCR) at day 14 of 87.9 and 96.9 %, respectively. The former product was better tolerated than the latter since more side effects were observed for the artesunate-amodiaquine combination. These results indicated that PR 259 CT1 can be considered as a promising candidate for the development of a herbal medicine for the treatment of uncomplicated falciparum malaria. © Georg Thieme Verlag KG Stuttgart · New York

Identification of the PfK13 mutations R561H and P441L in Democratic Republic of Congo (DRC).

BACKGROUND: Partial artemisinin resistance, mediated by P. falciparum K13 (PfK13) mutations, has been confirmed in certain areas of East Africa which are historically associated with high-level antimalarial resistance. DRC borders these areas in the East. OBJECTIVES: To determine the prevalence of resistance markers in six national malaria control programme (NMCP) surveillance sites; Boende, Kabondo, Kapolowe, Kimpese, Mikalayi and Rutshuru. METHODS: The SNPs in P. falciparum genes PfK13, Pfdhfr, Pfdhps, Pfmdr1 and Pfcrt were assessed using targeted NGS of isolates collected at enrolment in therapeutic efficacy studies. RESULTS: PfK13 SNPs were detected in two samples; in Kabondo (R561H) and in Rutshuru (P441L), both areas near Uganda and Rwanda. The Pfdhps ISGEGA haplotype, associated with reduced SP chemoprevention efficacy, ranged from 0.8% in Mikalayi (central DRC) to 42.2% in Rutshuru (East DRC). CONCLUSIONS: R561H and P441L observed in eastern DRC are a concern, as they are associated with delayed ACT-clearance and candidate marker of resistance, respectively. This is consistent with previous observations of shared drug resistance profiles in parasites of that region with bordering areas of Rwanda and Uganda. The likely circulation of parasites has important implications for the ongoing surveillance of partial artemisinin-resistant P. falciparum and for future efforts to mitigate its dispersal