Evidence map›Paper›PMID 33716085›Full record

ArticleJournal of ethnopharmacology2021

Artemisia annua L. extracts inhibit the in vitro replication of SARS-CoV-2 and two of its variants.

M S Nair, Y Huang, D A Fidock, S J Polyak, J Wagoner, M J Towler, P J Weathers

Open access · greenAbstract read
In one paragraph

Article in Journal of ethnopharmacology, 2021. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Cited by 64 papers, 1 of them a synthesis that pooled it.

0numbers the graph read from it
0cells of the map it votes in
64citing papers in PubMed, 1 pooled it
7.0field-weighted citation impact, top 2% of its field
1 · What the graph read from it

What it found

Each row is one number read from the abstract, on the scale the paper reported it, with its interval. Left of the dashed line favours the treatment, right favours the comparator. Under each row is the sentence it came from. New to these charts? A ten-minute tutorial.

The abstract states no effect estimate the extractor could read, or names no intervention and outcome on the map, so this paper lights no cell and moves no belief. It is still indexed, cited and linked below.

2 · The registry

The trial behind it

Trials whose registry record cites this paper, or whose number appears in the abstract. A trial that started after this paper was published is citing it as background, not reporting it.

Neither the registry nor the abstract names a trial number. If this is a trial report, that itself is worth knowing.

3 · Its place in the literature

Who cites it

64 citing papers in PubMed, 1 synthesis or guideline pooled it, 123 citations in OpenAlex.

  1. Pooled it
  2. Effect of Water Extract ofAnimals : an open access journal from MDPI · 2026
    Article
  3. Antiviral Activity of Medicinal Plant ExtractsPathogens (Basel, Switzerland) · 2025
    Article
  4. Review
  5. Profiling of sesquiterpenoid fractions fromBiomolecules & biomedicine · 2025
    Article
  6. Review
  7. Review
  8. Medicinal plants as more sustainable therapeutic solutions:Global health economics and sustainability · 2025
    Article
  9. Article
  10. The Antiviral and Antimalarial Prodrug Artemisinin from theCurrent issues in molecular biology · 2024
    Review
  11. Article
  12. Article
  13. Article
  14. Article
  15. Review
  16. Review
  17. Five DifferentInternational journal of molecular sciences · 2023
    Article
  18. Anti-SARS-CoV-2 Agents inJournal of fungi (Basel, Switzerland) · 2023
    Article
  19. Artemisinin as a therapeuticNatural product reports · 2023
    Review
  20. Article

4 more citing papers are in PubMed but not listed here.

4 · The record

Corrections and comments

  • Update of
    2021
5 · Who and what money

Authors and funding

7 authors at 5 institutions in 1 country.

M S NairAaron Diamond AIDS Research Center, Columbia University Vagelos College of Physicians and Surgeons, New York, NY, USA. Electronic address: mn2947@cumc.columbia.edu.
Y HuangAaron Diamond AIDS Research Center, Columbia University Vagelos College of Physicians and Surgeons, New York, NY, USA. Electronic address: yh3253@cumc.columbia.edu.
D A FidockDepartment of Microbiology and Immunology, Columbia University Irving Medical Center, New York, NY 10032, USA; Division of Infectious Diseases, Department of Medicine, Columbia University Irving Medical Center, New York, NY, 10032, USA. Electronic address: df2260@cumc.columbia.edu.
S J PolyakDepartment of Laboratory Medicine and Pathology, University of Washington, Seattle, WA, 98104, USA. Electronic address: polyak@uw.edu.
J WagonerDepartment of Laboratory Medicine and Pathology, University of Washington, Seattle, WA, 98104, USA. Electronic address: jw25@uw.edu.
M J TowlerDepartment of Biology and Biotechnology, Worcester Polytechnic Institute, Worcester, MA, 01609, USA. Electronic address: eeyore@wpi.edu.
P J WeathersDepartment of Biology and Biotechnology, Worcester Polytechnic Institute, Worcester, MA, 01609, USA. Electronic address: weathers@wpi.edu.
University of Washington · USWorcester Polytechnic Institute · USAaron Diamond AIDS Research Center · USColumbia University · USColumbia University Irving Medical Center · US

Funding

Urgent Covid-19 Revision to the Center for High-Throughput Functional Annotation of Natural ProductsU41AT008718 · NCCIH · UT SOUTHWESTERN MEDICAL CENTER · PI CECH, NADJA B, LININGTON, ROGER G · 2015 to 2024
$10.1M
Defining P. falciparum resistance to artemisinin-based combination therapiesR01AI109023 · NIAID · COLUMBIA UNIVERSITY HEALTH SCIENCES · PI FIDOCK, DAVID A · 2014 to 2025
$4.4M
Study how the liver alters bioavailability of artemisinin when delivered from the dried leaves of the plant Artemisia annua vs as pure drug.R15AT008277 · NCCIH · WORCESTER POLYTECHNIC INSTITUTE · PI WEATHERS, PAMELA J · 2014 to 2018
$953k
NCCIH NIH HHS R15 AT008277NCCIH NIH HHS U41 AT008718NIAID NIH HHS R01 AI109023
6 · The paper itself

Abstract

ethnopharmacological relevanceArtemisia annua L. has been used for millennia in Southeast Asia to treat "fever". Many infectious microbial and viral diseases have been shown to respond to A. annua and communities around the world use the plant as a medicinal tea, especially for treating malaria. AIM OF THE STUDY: SARS-CoV-2 (the cause of Covid-19) globally has infected and killed millions of people. Because of the broad-spectrum antiviral activity of artemisinin that includes blockade of SARS-CoV-1, we queried whether A. annua suppressed SARS-CoV-2. MATERIALS AND

methodsUsing Vero E6 and Calu-3 cells, we measured anti SARS-CoV-2 activity against fully infectious virus of dried leaf extracts of seven cultivars of A. annua sourced from four continents. IC50s were calculated and defined as the concentrations that inhibited viral replication by 50%; CC50s were also calculated and defined as the concentrations that kill 50% of cells.

resultsHot-water leaf extracts based on artemisinin, total flavonoids, or dry leaf mass showed antiviral activity with IC

conclusionsA. annua extracts inhibit SARS-CoV-2 infection, and the active component(s) in the extracts is likely something besides artemisinin or a combination of components that block virus infection at a step downstream of virus entry. Further studies will determine in vivo efficacy to assess whether A. annua might provide a cost-effective therapeutic to treat SARS-CoV-2 infections.

Indexed as

AnimalsAntiviral AgentsArtemisia annuaArtemisininsCell LineCell Line, TumorChlorocebus aethiopsCOVID-19COVID-19 Drug TreatmentFlavonoidsHumansPlant ExtractsPlant LeavesSARS-CoV-2Spike Glycoprotein, CoronavirusVero CellsAntiviral AgentsartemisininArtemisininsartenimolFlavonoidsPlant ExtractsSpike Glycoprotein, Coronavirusspike protein, SARS-CoV-2AmodiaquineArtemetherArtemisia annuaArtemisininArtesunateCovid-19DeoxyartemisininDihydroartemisininSARS-CoV-2

Identifiers

PMID33716085
PMCPMC7952131
OpenAlexW3134666776

What OpenQuestion holds

Textmetadata
LicenceTDM
Read underepoch 390

Registered trials

None linked

Read under generation 80e0d062 · epoch 390. Bibliography from PubMed, PubMed Central and OpenAlex; grants from NIH RePORTER; trial links from ClinicalTrials.gov; estimates, votes and beliefs from the OpenQuestion graph.