Separating confirmed findings from speculation on coronaviruses, intermediate hosts, and pangolins
When early genomic analyses of SARS-CoV-2 identified similarities between the new virus and coronaviruses found in trafficked pangolins, the connection made headlines worldwide. Conservation organisations braced for a backlash. Some feared that associating pangolins with the COVID-19 pandemic would add stigma to an animal already under catastrophic pressure from the illegal trade.
Five years on, the science is more nuanced than the initial headlines suggested. Pangolins did harbour related coronaviruses. But calling them the cause of COVID-19 is not supported by the evidence. Here is what the peer-reviewed research actually shows.
The key studies emerged in 2020, drawing on samples from Sunda pangolins (Manis javanica) seized by Chinese customs and forestry authorities in Guangdong and Guangxi provinces between 2017 and 2019. Two research groups published findings simultaneously in the journal Nature in July 2020.
The coronaviruses identified in these pangolins were betacoronaviruses in the same broad family as SARS-CoV-2. What drew intense attention was the receptor-binding domain (RBD) of the pangolin viruses. The RBD is the molecular key that a coronavirus uses to attach to human ACE2 receptors and gain entry to cells. In this specific region, some pangolin coronavirus variants showed a similarity of over 97% with SARS-CoV-2.
This partial similarity is scientifically significant. It suggests that pangolin coronaviruses and SARS-CoV-2 may share a common ancestral lineage, or that genetic recombination between bat and pangolin coronaviruses could have contributed to the evolution of a virus capable of infecting humans. But overall genome similarity of 85-92% is not close enough to identify pangolins as the direct progenitor of SARS-CoV-2.
The closest known relative to SARS-CoV-2 remains a bat coronavirus designated RaTG13, sampled from a horseshoe bat (Rhinolophus affinis) in Yunnan province in 2013 by researchers at the Wuhan Institute of Virology. RaTG13 shares approximately 96.2% overall genome similarity with SARS-CoV-2.
That 3.8% difference, while appearing small, represents decades of evolutionary divergence at the rate coronaviruses mutate. Scientists estimate the bat lineage and SARS-CoV-2 last shared a common ancestor 40-70 years before the pandemic. This means there is a gap in the evolutionary record -- a missing intermediate step or steps between the bat reservoir and the human-infecting virus.
Pangolins were proposed as candidates to fill this evolutionary gap, partly because of the RBD similarity and partly because they are known to come into close contact with humans through the wildlife trade. An illegal pangolin market where animals are held in crowded, stressed conditions alongside other wildlife would represent exactly the kind of mixing vessel where viral recombination could occur.
For an animal to be confirmed as the intermediate host through which a pathogen jumps from its natural reservoir to humans, several criteria need to be met. The virus found in the intermediate host must be closely related to the human strain across the entire genome, not just in one functional region. The animal must have been present at or connected to the spillover site. And ideally, epidemiological tracing should link infected animals to the index cases.
Pangolins do not satisfy these criteria for SARS-CoV-2.
Pangolins harbouring related coronaviruses is not the same as pangolins causing COVID-19. A distant genetic relationship does not establish a transmission chain. The two findings are scientifically distinct claims, and only the first is supported by the evidence collected so far.
What many researchers now consider more plausible than a direct bat-to-pangolin-to-human jump is a recombination scenario. Coronaviruses have high rates of genetic recombination: when two different coronavirus strains infect the same cell simultaneously, they can exchange genetic segments, producing a new hybrid virus with characteristics from both parents.
Under this model, a bat coronavirus and a pangolin coronavirus could have co-infected a host -- or separate hosts in close proximity -- and exchanged the receptor-binding domain. The resulting recombinant virus, carrying the bat lineage backbone but with a pangolin-derived or pangolin-influenced RBD adapted to mammalian ACE2 receptors, could then have acquired additional mutations enabling efficient human transmission.
This remains a hypothesis. It is consistent with the genetic evidence but has not been demonstrated experimentally or confirmed through field sampling.
Parallel to the natural spillover investigation, a laboratory incident hypothesis -- the idea that SARS-CoV-2 originated from a leak at the Wuhan Institute of Virology or another research facility -- has been investigated by multiple agencies including the US Intelligence Community and a WHO-convened scientific advisory group.
As of 2026, neither hypothesis has been definitively proven or ruled out. The US intelligence agencies remain divided, with different agencies assigning varying probability assessments to natural spillover versus laboratory origins. Access to early patient samples and primary data from China has been limited, constraining independent investigation.
This unresolved status does not change the scientific assessment of pangolins specifically. Regardless of which origin pathway is ultimately confirmed, pangolins are not identified as the definitive vector in either scenario.
The COVID-19 pandemic created a moment where pangolin conservation received global media coverage it had never previously achieved. For a decade, conservation organisations had struggled to make the public care about an obscure, nocturnal, scale-covered mammal that most people had never seen. Suddenly the word "pangolin" was appearing in mainstream news worldwide.
The challenge was that the coverage was overwhelmingly negative -- framing pangolins as potential disease vectors rather than conservation subjects. This narrative risked generating the opposite of the desired public response: rather than sympathy, it could produce fear or hostility toward an animal that was already being driven toward extinction by human demand.
Several conservation bodies used the COVID-19 period to argue for an end to legal loopholes in the wildlife trade that create cover for illegal markets. China removed pangolin products from its national pharmacopoeia in 2020 and upgraded pangolin protection status domestically. Whether these changes persist and translate into reduced trafficking pressure remains a monitoring question for the coming years.
Seizure data from the period 2020-2024 do not show a clear reduction in pangolin trafficking volumes attributed to the COVID-19 association. Some market disruption occurred due to lockdowns and reduced border traffic, but demand-side pressure in Vietnam and China appears to have resumed as restrictions lifted.
In southern and central Africa, where ground pangolin and tree pangolin populations are harvested for the export trade, ranger teams and community monitoring programmes report continued poaching pressure. The pandemic did not translate into a conservation reprieve for wild populations.
Research into pangolin coronavirus prevalence has intensified since 2020. Studies of wild and rescued pangolins in Southeast Asia and Africa are collecting samples to build a broader picture of the coronaviruses pangolins naturally carry and the factors that influence prevalence. This research serves dual purposes: understanding zoonotic risk and building the baseline population health data that effective conservation requires.
The scientific questions outstanding as of mid-2026 include:
Pangolins hosted coronaviruses related to SARS-CoV-2. This is confirmed by peer-reviewed genomic analysis. The receptor-binding domain of some pangolin coronaviruses closely resembles that of SARS-CoV-2, suggesting an evolutionary connection. However, no pangolin coronavirus is sufficiently similar across its complete genome to be identified as the direct ancestor of the pandemic virus.
Pangolins are not confirmed as the intermediate host of SARS-CoV-2. The origin of the pandemic remains under scientific and political investigation. What is clear is that conditions created by the illegal wildlife trade -- stressed animals in close contact with other species and with humans -- maximise the probability of zoonotic spillover events, regardless of the specific virus.
Addressing that structural risk requires ending the illegal wildlife trade, not assigning blame to the animals caught within it.
Pangolins harbour coronaviruses related to SARS-CoV-2 but are not confirmed as the cause or intermediate host of COVID-19. The overall genome similarity between pangolin coronaviruses and SARS-CoV-2 is insufficient for direct ancestry. The pandemic's origin remains unresolved. Conservation of pangolins and reduction of the illegal wildlife trade are the correct responses to zoonotic spillover risk -- not stigmatisation of the animals involved.
The scientific consensus is that pangolins are not the direct origin of SARS-CoV-2, but they may have hosted an ancestral coronavirus that contributed genetic material to the virus lineage. No pangolin coronavirus matches SARS-CoV-2 closely enough to be a direct progenitor. The exact spillover pathway remains under investigation.
Sunda pangolins seized in anti-trafficking operations in Guangdong and Guangxi provinces tested positive for betacoronaviruses in 2019-2020. The receptor-binding domain of these pangolin coronaviruses showed high similarity to SARS-CoV-2, but overall genome similarity was only around 85-92%, not sufficient to confirm direct ancestry.
As of 2026, the exact origin of SARS-CoV-2 has not been definitively resolved. Both a natural zoonotic spillover route and a laboratory incident hypothesis remain under scientific and political investigation.
No. Even if pangolins harboured a related coronavirus, the conditions that enabled human exposure were created by illegal wildlife trade and wet markets -- human-created systems. Stigma toward wildlife harms conservation efforts and misidentifies where the real risk lies.