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Antiviral Activity of Repurposing Ivermectin against a Panel of 30 Clinical SARS-CoV-2 Strains Belonging to 14 Variants

Delandre et al., Pharmaceuticals, doi:10.3390/ph15040445
Apr 2022  
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HCQ for COVID-19
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*, now known with p < 0.00000000001 from 421 studies, recognized in 42 countries.
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3,800+ studies for 60+ treatments.
In Vitro study with 30 COVID-19 strains from 14 variants, showing stronger efficacy with ivermectin compared to CQ and remdesivir, and relatively homogeneous efficacy with ivermectin regardless of strain/variant, in contrast to results for CQ and remdesivir.
CQ showed better efficacy for omicron compared to most other variants.
Study covers ivermectin, HCQ, and remdesivir.
Delandre et al., 2 Apr 2022, peer-reviewed, 12 authors.
In Vitro studies are an important part of preclinical research, however results may be very different in vivo.
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Antiviral Activity of Repurposing Ivermectin against a Panel of 30 Clinical SARS-CoV-2 Strains Belonging to 14 Variants
Océane Delandre, Mathieu Gendrot, Priscilla Jardot, Marion Le Bideau, Manon Boxberger, Céline Boschi, Isabelle Fonta, Joel Mosnier, Sébastien Hutter, Anthony Levasseur, Bernard La Scola, Bruno Pradines
Pharmaceuticals, doi:10.3390/ph15040445
Over the past two years, several variants of SARS-CoV-2 have emerged and spread all over the world. However, infectivity, clinical severity, re-infection, virulence, transmissibility, vaccine responses and escape, and epidemiological aspects have differed between SARS-CoV-2 variants. Currently, very few treatments are recommended against SARS-CoV-2. Identification of effective drugs among repurposing FDA-approved drugs is a rapid, efficient and low-cost strategy against SARS-CoV-2. One of those drugs is ivermectin. Ivermectin is an antihelminthic agent that previously showed in vitro effects against a SARS-CoV-2 isolate (Australia/VI01/2020 isolate) with an IC50 of around 2 µM. We evaluated the in vitro activity of ivermectin on Vero E6 cells infected with 30 clinically isolated SARS-CoV-2 strains belonging to 14 different variants, and particularly 17 strains belonging to six variants of concern (VOC) (variants related to Wuhan, alpha, beta, gamma, delta and omicron). The in vitro activity of ivermectin was compared to those of chloroquine and remdesivir. Unlike chloroquine (EC50 from 4.3 ± 2.5 to 29.3 ± 5.2 µM) or remdesivir (EC50 from 0.4 ± 0.3 to 25.2 ± 9.4 µM), ivermectin showed a relatively homogeneous in vitro activity against SARS-CoV-2 regardless of the strains or variants (EC50 from 5.1 ± 0.5 to 6.7 ± 0.4 µM), except for one omicron strain (EC50 = 1.3 ± 0.5 µM). Ivermectin (No. EC50 = 219, mean EC50 = 5.7 ± 1.0 µM) was, overall, more potent in vitro than chloroquine (No. EC50 = 214, mean EC50 = 16.1 ± 9.0 µM) (p = 1.3 × 10 −34 ) and remdesivir (No. EC50 = 201, mean EC50 = 11.9 ± 10.0 µM) (p = 1.6 × 10 −13 ). These results should be interpreted with caution regarding the potential use of ivermectin in SARS-CoV-2-infected patients: it is difficult to translate in vitro study results into actual clinical treatment in patients.
Supplementary Materials: The following supporting information can be downloaded at:, Table S1 : List of nucleotide and amino acid changes associated with the different SARS-CoV-2 variants. Conflicts of Interest: The authors declare no conflicts of interest. The findings and conclusion of this report are those of the authors and do not represent the views of the Ministère des Armées and Ministère de l'Enseignement Supérieur, de la Recherche et de l'Innovation.
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