New analysis of previously overlooked maps of the Huanan Wholesale Market in Wuhan, China, is refocusing attention on the early days of the COVID-19 pandemic and raising questions about potentially missing key data regarding the outbreak’s origins. The findings, published March 16, 2026, suggest that crucial information about the initial spread of the virus may remain unknown.
The analysis, conducted by evolutionary biologist Florence Débarre, a researcher at the CNRS in France, meticulously examines a series of market maps that surfaced in an anonymous post on the Chinese social media platform WeChat in 2021. What was initially dismissed as a conspiracy theory may, surprisingly, contain relevant clues about the earliest SARS-CoV-2 infections. Understanding the pandemic’s origins is critical for preventing and preparing for future outbreaks.
According to the report, the document carefully assesses the information included in the maps and compares it to data released by Chinese authorities and various scientific studies. The results are striking: details that seemed unverifiable in 2021 have since appeared in official documents or scientific investigations.
This unexpected alignment between the leaked material and subsequently published data has reignited a debate that appeared to have stalled. Researchers are now questioning whether the maps originated from someone with access to information that was never made public.
A Social Media Post Concealed More Information Than It Seemed
The story began in September 2021, when an anonymous user posted an extensive text accompanied by detailed maps of the Huanan Wholesale Market – the location of the first large known COVID-19 outbreak – on WeChat.
The post promoted a widely discredited theory: that the virus had arrived in China on frozen products, specifically lobsters from the state of Maine in the United States. This idea was part of a narrative pushed by some sectors in China to suggest the virus originated outside the country.
The scientific community quickly dismissed this hypothesis. Still, the maps included in the post piqued the interest of some researchers for a different reason: they contained an unusual level of detail.
As the analyzed report indicates, these market plans precisely identified various stalls, the location of virus-positive environmental samples and even vendors who apparently developed antibodies against SARS-CoV-2.
This last detail is particularly noteworthy. Antibody tests are a basic tool in epidemiological investigations because they can detect past infections, even when the virus is no longer present.
However, official reports of antibody testing of Huanan Market vendors had not previously been made.
What the Huanan Market Maps Reveal
The maps included in the WeChat post highlighted several specific elements within the market. First, they identified stalls where confirmed human infections with SARS-CoV-2 were reportedly detected. They also indicated areas of the market where the virus was found in the environment, such as floors or drainage systems.
Comparing these details with maps published later by official organizations and scientific studies, Débarre detected striking coincidences.
As her analysis reveals, some of the points marked on the anonymous map correspond to locations where positive samples were later confirmed in subsequent investigations. This suggests that whoever created the map had access to internal or preliminary information that had not yet been made public in 2021.
But the most intriguing data appears in another section of the map: the presence of 17 vendors at the market who reportedly developed antibodies against the virus.
In the context of an initial outbreak, this information could support reconstruct how the virus spread among market workers and which areas of the enclosure were involved in the first infections.
Stall 6-29 and Animals Susceptible to the Virus
Another of the most discussed elements of the report relates to a specific stall in the market identified as 6-29. According to the analyzed maps, 18 samples from animals at that location tested positive for SARS-CoV-2.
This data aligns with research published in 2023 that analyzed genetic material obtained from the market. These analyses revealed a mixture of coronavirus RNA along with DNA from animals susceptible to infection, including raccoon dogs and civets.
These animals are particularly relevant because they are already known to be able to turn into infected with coronaviruses similar to SARS. This coincidence does not definitively prove that the virus jumped from animals to humans at that stall. But it does reinforce the idea that there were potentially infected animals in the market.
This scenario fits with the hypothesis of a zoonotic origin, that is, a jump of the virus from an animal to a person.
However, it is also possible that the process occurred in reverse: that infected humans contaminated the market environment or even the animals themselves. Here’s less likely, as several environmental samples positive for the virus were located in wildlife sales areas and were mixed with DNA from susceptible mammals, a pattern more consistent with the presence of infected animals than with simple human contamination. But the available information still does not allow distinguishing between the two scenarios.
The Major Problem: Lack of Complete Data
Beyond what the maps reveal, the report revisits a concern many scientists have raised for years: the absence of complete data about the Huanan Market.
Since the start of the pandemic, international researchers have requested access to epidemiological records, biological samples, and analyses conducted during the first weeks of the outbreak.
As the analysis by Débarre points out, comparing the different maps published to date shows inconsistencies and gaps in information.
Some details appear in certain documents but not others, and certain data – such as possible antibody tests in vendors – have never been officially explained.
The World Health Organization, even as noting that the weight of evidence leans toward transmission from animals, has repeatedly insisted on the need for all available information to be shared to accurately reconstruct the virus’s origin. Without complete access to the data, any hypothesis will remain difficult to confirm or definitively rule out.
A Scientific Mystery That Remains Open
Six years after the start of the pandemic, the origin of SARS-CoV-2 remains one of the great contemporary scientific enigmas. Most studies published to date point to a natural origin linked to the trade in wild animals. But other hypotheses, including the possibility of a laboratory accident, persist.
The report on the Huanan Market maps does not solve this debate. What it does do is remind us that there may still be pieces of the puzzle that have not come to light.
As the analysis reveals, a simple message forgotten on social media can contain information that, years later, acquires unexpected relevance.
Until all the data collected in Wuhan during the first weeks of the outbreak is known, the origin of COVID-19 will remain an open chapter in recent scientific history.
