Trial reportInternational journal of general medicine2021
Efficacy of a Nasal Spray Containing Iota-Carrageenan in the Postexposure Prophylaxis of COVID-19 in Hospital Personnel Dedicated to Patients Care with COVID-19 Disease.
Trial report in International journal of general medicine, 2021. The graph could read no effect estimate from its abstract, so it casts no vote on the map. It is linked to 2 registered trials, which are not on this map. Cited by 46 papers, 3 of them syntheses that pooled 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.
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.
Efficacy of a Nasal Spray Containing Iota-Carrageenan in the Prophylaxis of COVID-19 Disease in Health Personnel Dedicated to Patients Care With COVID-19. Multicenter, Randomized, Double-blind, Placebo-controlled Trial (CARR-COV-02)
A Randomised, Placebo-controlled Trial to Investigate the Efficacy of Intranasal Heparin Treatment to Reduce Transmission of SARS-CoV-2 Infection and COVID 19 Disease Among Household Contacts of SARS-CoV-2+ Adults and Children
Who cites it
46 citing papers in PubMed, 3 syntheses or guidelines pooled it, 75 citations in OpenAlex.
- Comparison of Preprint Postings of Randomized Clinical Trials on COVID-19 and Corresponding Published Journal Articles: A Systematic Review.JAMA network open · 2023Pooled it
- Efficacy of Mouth Rinses and Nasal Spray in the Inactivation of SARS-CoV-2: A Systematic Review and Meta-Analysis ofInternational journal of environmental research and public health · 2022Pooled it
- Prophylaxis against covid-19: living systematic review and network meta-analysis.BMJ (Clinical research ed.) · 2021Pooled it
- Human monoclonal antibody F61 nasal spray effectively protected high-risk populations from SARS-CoV-2 variants during the COVID-19 pandemic from late 2022 to early 2023 in China.Emerging microbes & infections · 2024Trial
- RETRACTED: Evaluating the efficacy and safety of a novel prophylactic nasal spray in the prevention of SARS-CoV-2 infection: A multi-centre, double blind, placebo-controlled, randomised trial.Journal of clinical virology : the official publication of the Pan American Society for Clinical Virology · 2022Trial
- The Saliva of Probands Sucking an Iota-Carrageenan Containing Lozenge Inhibits Viral Binding and Replication of the Most Predominant Common Cold Viruses and SARS-CoV-2.International journal of general medicine · 2021Trial
- Carrageenan: Food Additive or Health Concern? A Comprehensive Review.Annals of nutrition & metabolism · 2026Review
- Article
- Bioprinting in Tissue Repair and Its ENT Applications.Polymers · 2026Review
- The Role of ACE2 in SARS-CoV-2 Infection, Pathogenesis, and Antiviral Interventions.Journal of medical virology · 2025Review
- A pan-respiratory virus attachment inhibitor with high potency in human airway models and in vivo.Science advances · 2025Article
- Carrageenans and the Carrageenan-Echinochrome Complex as Anti-SARS-CoV-2 Agents.International journal of molecular sciences · 2025Article
- Nasal Emulgel's Role in Preventing Coronavirus Infection.Pharmaceutics · 2025Article
- Synergistic Antiviral Activity of European Black Elderberry Fruit Extract and Quinine Against SARS-CoV-2 and Influenza A Virusa.Nutrients · 2025Article
- Synthetic heparan sulfate mimics based on chitosan derivatives show broad-spectrum antiviral activity.Communications biology · 2025Article
- Debulking influenza and herpes simplex virus strains by a wide-spectrum anti-viral protein formulated in clinical grade chewing gum.Molecular therapy : the journal of the American Society of Gene Therapy · 2025Article
- Holistic care in mild upper respiratory tract infections (MURTIs): an approach to individualized care management.Drugs in context · 2025Review
- Evaluation of Biologics ACE2/Ang(1-7) Encapsulated in Plant Cells for FDA Approval: Safety and Toxicology Studies.Pharmaceutics · 2024Article
- Why Certain Repurposed Drugs Are Unlikely to Be Effective Antivirals to Treat SARS-CoV-2 Infections.Viruses · 2024Article
- SARS-CoV-2 spike protein-ACE2 interaction increases carbohydrate sulfotransferases and reduces N-acetylgalactosamine-4-sulfatase by p38 MAPK.Signal transduction and targeted therapy · 2024Article
Corrections and comments
PubMed lists nothing against this paper. Absence here is not a guarantee, only a check that was made.
Authors and funding
18 authors at 10 institutions in 3 countries.
Funding
No grant is acknowledged in the PubMed record.
Abstract
backgroundIota-Carrageenan (I-C) is a sulfate polysaccharide synthesized by red algae, with demonstrated antiviral activity and clinical efficacy as nasal spray in the treatment of common cold. In vitro, I-C inhibits SARS-CoV-2 infection in cell culture. RESEARCH QUESTION: Can a nasal spray with Iota-Carrageenan be useful in the prophylaxis of COVID-19 in health care workers managing patients with COVID-19 disease? STUDY DESIGN AND
methodsThis is a pilot pragmatic multicenter, randomized, double-blind, placebo-controlled study assessing the use of a nasal spray containing I-C in the prophylaxis of COVID-19 in hospital personnel dedicated to care of COVID-19 patients. Clinically healthy physicians, nurses, kinesiologists and other health care providers managing patients hospitalized for COVID-19 were assigned in a 1:1 ratio to receive four daily doses of I-C spray or placebo for 21 days. The primary end point was clinical COVID-19, as confirmed by reverse transcriptase polymerase chain reaction testing, over a period of 21 days. The trial is registered at ClinicalTrials.gov (NCT04521322).
resultsA total of 394 individuals were randomly assigned to receive I-C or placebo. Both treatment groups had similar baseline characteristics. The incidence of COVID-19 differs significantly between subjects receiving the nasal spray with I-C (2 of 196 [1.0%]) and those receiving placebo (10 of 198 [5.0%]). Relative risk reduction: 79.8% (95% CI 5.3 to 95.4; p=0.03). Absolute risk reduction: 4% (95% CI 0.6 to 7.4).
interpretationIn this pilot study a nasal spray with I-C showed significant efficacy in preventing COVID-19 in health care workers managing patients with COVID-19 disease. CLINICAL TRIALS REGISTRATION: NCT04521322.
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Registered trials
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 Socratic graph.