ArticleLancet (London, England)2020
Safety, tolerability, and immunogenicity of a recombinant adenovirus type-5 vectored COVID-19 vaccine: a dose-escalation, open-label, non-randomised, first-in-human trial.
Article in Lancet (London, England), 2020. The graph could read no effect estimate from its abstract, so it casts no vote on the map. It is linked to trial NCT04944095 (Serology Testing), which is not on this map. Cited by 851 papers, 2 of them syntheses that pooled it.
What it found
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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.
Serology Testing (Antibody Levels) With Time Following SARS-CoV-2 (Covid-19) Vaccinations in Residents of Nursing, Extended Care, and Over-55 Communities
Who cites it
851 citing papers in PubMed, 2 syntheses or guidelines pooled it, 1,450 citations in OpenAlex.
- Antibody titers of individuals vaccinated for COVID-19: A systematic review.Journal of biosciences · 2023Pooled it
- Immunogenicity, efficacy, and safety of SARS-CoV-2 vaccine dose fractionation: a systematic review and meta-analysis.BMC medicine · 2022Pooled it
- Immunogenicity and safety of a COVID-19 DNA vaccine in healthy adults and elderly: A randomized, observer-blind, placebo-controlled phase 2 trial.Human vaccines & immunotherapeutics · 2025Trial
- An intranasally administered adenovirus-vectored SARS-CoV-2 vaccine induces robust mucosal secretory IgA.JCI insight · 2024Trial
- Trial
- GRAd-COV2 vaccine provides potent and durable humoral and cellular immunity to SARS-CoV-2 in randomized placebo-controlled phase 2 trial.Cell reports. Medicine · 2023Trial
- Trial
- Safety and immunogenicity of anti-SARS-CoV-2 heterologous scheme with SOBERANA 02 and SOBERANA Plus vaccines: Phase IIb clinical trial in adults.Med (New York, N.Y.) · 2022Trial
- DNA-based vaccines: Advances, applications, and future prospects.Genes & diseases · 2026Review
- Systemic and Mucosal Immune Responses From Serotype-Switched Viral-Vectored Ebola Vaccines.Journal of medical virology · 2026Article
- Bovine Adenovirus 3-Based Viral Vectors for Veterinary Vaccine Development: Progress, Limitations, and Future Directions.Veterinary sciences · 2026Review
- The immunogenicity and safety of adenoviral-based vaccines.Current opinion in allergy and clinical immunology · 2026Review
- Current status on encephalitic alphavirus vaccines development: Advances, challenges, and global health perspectives.Infectious medicine · 2026Review
- The role of naturally occurring and vaccine-induced Ad26 neutralizing antibodies in immunogenicity of Ad26-based vaccines.NPJ vaccines · 2026Article
- Displayed and encoded antigens on adenovirus vectors optimize humoral and cellular immune responses in rhesus macaques.Journal of virology · 2026Article
- Comprehensive genome editing and signaling pathway engineering evolve potent and safe adenoviral producer cell.Communications biology · 2026Article
- Evaluating COVID-19 vaccine allocation policies using Bayesian m-top exploration.Scientific reports · 2026Article
- Rapid and potent induction of protective mucosal immunity against SARS-CoV-2 by an adenovirus-vectored nanoparticle vaccine.Journal of nanobiotechnology · 2026Article
- Combination of adenovirus vector and subunit protein elicits a robust immune response against the SARS-CoV-2 Omicron variant.Molecular biomedicine · 2026Article
- Research progress of nucleocapsid protein of novel coronavirus: structure, function and targeted therapy.Archives of virology · 2026Review
791 more citing papers are in PubMed but not listed here.
Corrections and comments
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Authors and funding
21 authors at 6 institutions in 1 country.
Funding
No grant is acknowledged in the PubMed record.
Abstract
backgroundA vaccine to protect against COVID-19 is urgently needed. We aimed to assess the safety, tolerability, and immunogenicity of a recombinant adenovirus type-5 (Ad5) vectored COVID-19 vaccine expressing the spike glycoprotein of a severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2) strain.
methodsWe did a dose-escalation, single-centre, open-label, non-randomised, phase 1 trial of an Ad5 vectored COVID-19 vaccine in Wuhan, China. Healthy adults aged between 18 and 60 years were sequentially enrolled and allocated to one of three dose groups (5 × 10
findingsBetween March 16 and March 27, 2020, we screened 195 individuals for eligibility. Of them, 108 participants (51% male, 49% female; mean age 36·3 years) were recruited and received the low dose (n=36), middle dose (n=36), or high dose (n=36) of the vaccine. All enrolled participants were included in the analysis. At least one adverse reaction within the first 7 days after the vaccination was reported in 30 (83%) participants in the low dose group, 30 (83%) participants in the middle dose group, and 27 (75%) participants in the high dose group. The most common injection site adverse reaction was pain, which was reported in 58 (54%) vaccine recipients, and the most commonly reported systematic adverse reactions were fever (50 [46%]), fatigue (47 [44%]), headache (42 [39%]), and muscle pain (18 [17%]. Most adverse reactions that were reported in all dose groups were mild or moderate in severity. No serious adverse event was noted within 28 days post-vaccination. ELISA antibodies and neutralising antibodies increased significantly at day 14, and peaked 28 days post-vaccination. Specific T-cell response peaked at day 14 post-vaccination.
interpretationThe Ad5 vectored COVID-19 vaccine is tolerable and immunogenic at 28 days post-vaccination. Humoral responses against SARS-CoV-2 peaked at day 28 post-vaccination in healthy adults, and rapid specific T-cell responses were noted from day 14 post-vaccination. Our findings suggest that the Ad5 vectored COVID-19 vaccine warrants further investigation.
fundingNational Key R&D Program of China, National Science and Technology Major Project, and CanSino Biologics.
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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 OpenQuestion graph.