When governments set out to vaccinate billions of people against COVID-19, they were not merely racing to manufacture enough doses. They were trying to keep seven interdependent flows moving at once: products, information, funds, knowledge, skilled workers, vaccine recipients, and waste. A new open-access study published on 13 July 2026 in Discover Analytics argues that disruptions in any one of these flows could delay the herd immunity milestones that nations had staked their pandemic exits on, and it offers the most comprehensive taxonomy to date of what actually went wrong.
Researchers Jeanne-Marie Lawrence and Nazanin Tajik conducted an exploratory qualitative content analysis of the COVID-19 vaccine supply chain experience. Because the academic literature on pandemic-era vaccine supply chains was sparse, they turned to the public domain, extracting data from white papers, reports, academic papers, and publicly available expert presentations involving more than 100 professionals from sectors spanning vaccine production, distribution, regulation, logistics, and administration. Their final dataset comprised 21 recorded events representing 108 experts and 29 hours of content, supplemented by 14 reports, white papers, and academic papers.
The selection process was deliberately rigorous. The authors searched YouTube using the broad term “COVID vaccine supply chain,” screened the top 201 recordings plus one recommended symposium, and retained only events of at least 30 minutes convened by credible organizations such as international bodies, government agencies, universities, and professional associations, presented by subject-matter experts. Politicians’ presentations, including congressional hearings, were excluded. Transcripts covering 18.5 hours of recorded time were downloaded and corrected against audio; the remaining 10.5 hours were transcribed manually and cross-checked twice over a four-month period.
Coding was performed first manually and then with NVivo software, starting from 721 raw codes that were refined into 124: one umbrella code, seven codes for the critical flows, and 116 primary and sub-factor causal disruptors, comprising 26 main factors and 90 sub-factors. A single coder maintained consistency throughout the roughly seven-month process of data collection, cleansing, and coding, and the authors established credibility through triangulation across source types, transferability through rich description, and dependability through meticulous coding records.
The seven flows themselves represent a reframing of what a vaccine supply chain is. Rather than a linear pipeline moving doses from factory to arm, the study conceptualizes pandemic vaccine supply chains as complex adaptive systems in which raw material suppliers, manufacturers, fill-and-finish facilities, logistics providers, regulators, governments, health-care providers, and recipients all interact and adapt. A disruption in one flow propagates through the others: a shortage of manufacturing inputs delays product flow, limited real-time data impairs allocation decisions, insufficient working capital constrains production and transport, and vaccine hesitancy disrupts demand planning while increasing waste.
Financial-flow disruptions proved far more consequential than background constraints. Rising operating costs, including higher jet fuel prices, increased air cargo costs, tariffs on vaccine-related inputs, and elevated storage and distribution expenses, hit the system hardest during what the authors call Phase 2 of vaccine distribution, when demand exceeded supply and slack was minimal. Working-capital shortfalls were particularly visible among smaller logistics firms, many of them small and medium-sized enterprises that had suffered severe revenue losses. Meanwhile, manufacturers were reluctant to expand capacity before demand was contractually secured, and some government subsidies and donor funding arrived too slowly to support production and frontline delivery when they were most needed.
Information-flow problems ranged from active cyberattacks against research, production, and cargo systems to fragmented digital infrastructure. In the United States, experts described the difficulty of coordinating allocation systems, jurisdictional ordering systems, and a logistics provider’s enterprise resource planning system that were not integrated in real time. Limited visibility into flight availability, warehouse stock, and trade lanes hampered logistics planning, while fragmented registration and scheduling systems frustrated vaccine recipients. Insufficiently granular Harmonized System codes also created customs uncertainty for specialized manufacturing inputs such as bioreactors.
Product-flow disruptors were the most frequently coded category, but the study shows that shortages extended far beyond finished doses. Vaccine production depended on stabilizers, adjuvants, glass tubing, rubber, silicone, filters, resins, tubing, and disposable bags, meaning a single missing input could stall manufacturing. Vaccine nationalism, including export bans, export licensing schemes, and hoarding by high-income countries, restricted movement of both doses and inputs. Capacity bottlenecks appeared across manufacturing, fill-finish, dry ice availability, air cargo, cold-chain storage, and vaccination sites, while quality failures, cold-chain excursions, regulatory delays, and coordination failures that prevented reallocation of doses before expiry removed usable supply even after manufacture.
Knowledge and labor flows revealed quieter but equally damaging weaknesses. Intellectual property protections, limited technology-sharing arrangements, and delayed use of compulsory licensing constrained additional manufacturers, particularly in developing regions, from producing vaccines, leaving countries without early technology access more dependent on external supply and more exposed to export restrictions. Training gaps left airports and ground handlers poorly prepared for temperature-sensitive products, dry ice, and emergency shipment procedures. Skilled-worker shortages affected biologics manufacturing, cold-chain handling, and nursing capacity, while visa delays, border restrictions, and quarantine mandates prevented specialists from traveling where needed, and airline workforce reductions compounded air cargo constraints because much freight travels in passenger aircraft bellies.
On the demand side, recipient flow swung from extreme initial surges that strained appointment systems and allocation mechanisms to declines driven by hesitancy, misinformation, fear of adverse effects, and access barriers such as online-only registration that disadvantaged seniors and rural residents. Waste flow, often overlooked in planning, generated its own pressures: limited biomedical waste infrastructure, high volumes of single-use packaging and temperature-controlled shipping materials, and training gaps in biohazard handling created bottlenecks that could interfere with safe, continuous vaccination. The authors caution that their findings derive from publicly disseminated sources, offer global-level insights without distinguishing vaccine technologies, and should be quantitatively validated through expert surveys, Delphi analysis, or modeling, but they argue the taxonomy provides a diagnostic framework so that future pandemic preparedness exercises test all seven flows rather than focusing narrowly on moving doses.
Subject of Research: Qualitative content analysis of disruptors in vaccine supply chains during the COVID-19 mass vaccination campaigns
Article Title: Analysis of vaccine supply chain disruptions during mass COVID-19 vaccination campaigns
Article References: Lawrence, J.-M., & Tajik, N. (2026). Analysis of vaccine supply chain disruptions during mass COVID-19 vaccination campaigns. Discover Analytics, 4(1), Article 29. https://doi.org/10.1007/s44257-026-00078-1
Image Credits: AI Generated
DOI: 10.1007/s44257-026-00078-1
Keywords: vaccine supply chain, COVID-19, mass vaccination, supply chain disruption, qualitative content analysis, cold chain logistics, vaccine hesitancy, technology transfer, vaccine nationalism, pandemic preparedness, waste management, skilled labor shortages
News Source: Kristina Jarvis. (October 29, 2026). Seven Critical Flows and 116 Disruptors Shaped COVID-19 Vaccine Supply Chains. Scienmag.
