Early in the pandemic, headlines around the world seemed to point to a simple story:
a “South Asian gene” on chromosome 3 that allegedly doubled the risk of dying from
COVID-19. It sounded like something straight out of a sci-fi movie – one stretch of
DNA, passed down from Neanderthals, deciding who ends up in the ICU and who walks
away with mild symptoms.

As usual, the real story is messier, more interesting, and much more hopeful. Yes,
genetics play a role in how your body responds to SARS-CoV-2. But newer research,
especially in South Asian populations themselves, shows that this one genetic region
is far from the whole picture. In fact, focusing too much on a single “South Asian
risk gene” can distract from bigger, fixable drivers of risk – like chronic health
conditions, crowded housing, job exposures, and unequal access to care.

Let’s unpack what scientists actually found, what later studies added, and what this
all means if you or your family have South Asian roots.

The origin of the “South Asian COVID gene” story

The conversation began with large genome-wide association studies (GWAS) that scanned
the DNA of people with severe COVID-19 and compared it with those who had milder
disease. These studies repeatedly flagged a region on chromosome 3, known as
3p21.31, as the most consistently associated locus with severe
COVID-19 and respiratory failure.

This region contains several genes involved in immune response and lung biology,
including LZTFL1, SLC6A20, CCR9, FYCO1,
CXCR6, and XCR1. Variants in or near these genes appeared more
often in people who became critically ill, suggesting that certain versions of this
DNA stretch might make it harder for the lungs and immune system to handle
SARS-CoV-2.

Then came the twist that launched a thousand headlines: researchers showed that the
high-risk haplotype in this region is likely of Neanderthal origin
and is especially common in people of South Asian ancestry, while being less common
in Europeans and rare in East Asians. Some reports estimated that around
60% of people with South Asian ancestry carry this high-risk
genetic signal, compared with roughly one in six people of European ancestry.

From there, the media did what media often does under deadline pressure: it turned
a nuanced, probability-based finding into a catchy line – “South Asian gene doubles
COVID-19 death risk.”

What newer research found in South Asian populations

Once the initial excitement faded, scientists did what they always should do:
replicate and refine. A key follow-up came from a Nature Scientific Reports
study that specifically looked at South Asian populations and the supposedly
“major” genetic risk factor for severe COVID-19. The authors found something
surprising: in their South Asian cohorts, that same chromosome 3 region did
not show a clear association with severe disease.

In other words, even though many people in these populations carried the alleged
high-risk haplotype, it wasn’t neatly mapping onto who ended up severely ill. Some
people with the variant had mild infections, while some without it became critically
sick. That’s a classic sign that:

• Other genetic factors matter.
• Non-genetic factors (like health conditions and exposures) matter a lot.
• One “headline gene” cannot explain the full story of COVID-19 risk.

More recent reviews of host genetics in COVID-19 echo this point. They confirm that
the 3p21.31 locus is important, but they also highlight many other genes and
pathways – from antiviral response to inflammatory signaling – that influence
susceptibility and severity. No single marker is destiny.

Genetics is probabilistic, not destiny

A useful way to think about the “South Asian gene” is like bad weather in the
forecast. If you live in an area where storms are more common, you’re more likely to
get caught in one over time. But on any given day, whether you get soaked depends on
lots of factors – whether you went outside, if you had an umbrella, how strong the
storm actually is.

Similarly, the chromosome 3 risk haplotype seems to raise the probability
of severe COVID-19 in some populations. But:

• Plenty of people with the haplotype never develop severe disease.
• Plenty of people without it still end up hospitalized or in the ICU.
• Other genetic regions – including those involved in interferon response, blood
  coagulation, and inflammation – also modify risk.

On top of that, genetic risk is layered on top of age, vaccination status, immune
history, chronic illnesses, and social context. When you zoom out from the lab and
look at real communities in the UK, US, Canada, and elsewhere, those other layers
start to dominate the picture.

Beyond genes: why South Asian communities were hit hard

By mid-pandemic, data from the UK, US, and other countries showed a troubling
pattern: South Asian, Black, and other minority ethnic groups often had higher
infection rates, more hospitalizations, and more deaths from COVID-19 than white
populations.

It would be convenient – and dangerously misleading – to say, “That’s just the gene.”
Large population-based studies and government reviews tell a very different story:
social determinants of health and underlying conditions explain a
big share of the disparity.

Social determinants and exposure risk

Research from England, Canada, the US, and global health journals has repeatedly
found that people from minority ethnic groups, including many South Asian
communities, were more likely to:

• Work in public-facing or essential jobs that could not be done remotely.
• Live in multigenerational or crowded housing, making isolation difficult.
• Reside in neighborhoods with higher deprivation and fewer resources.
• Face barriers to timely healthcare, testing, or paid sick leave.

These factors don’t care what’s on your chromosome 3. They simply increase the odds
that you’ll be exposed to the virus more often and have less space – literally and
figuratively – to protect yourself when cases surge.

Several systematic reviews and government reports on ethnic inequalities in COVID-19
emphasize this point: ethnicity is not a biological destiny, but a proxy for living
conditions, structural racism, and unequal opportunities. When you adjust for where
people live, what work they do, and how easily they can access care, the “ethnic
gap” in outcomes often shrinks substantially.

Chronic conditions: the heavy hitters in severe COVID-19

If there is a “short list” of things that consistently predict severe COVID-19, it
looks like this:

• Older age (especially 65+).
• Being unvaccinated or not up to date on boosters.
• Certain chronic health conditions – especially
  diabetes, obesity, chronic kidney disease, heart disease, and chronic lung
  disease.

CDC analyses and other large cohort studies show that having one or more of these
conditions significantly raises the risk of hospitalization and death. For example,
people with advanced kidney disease or complicated diabetes have some of the highest
odds of severe outcomes. The more conditions you have, the higher your risk climbs.

Why does this matter for South Asian communities? Because in many countries,
including the UK, US, and India, South Asian populations have:

• Higher rates of type 2 diabetes – often at younger ages and lower BMIs.
• Higher burdens of cardiovascular disease and metabolic syndrome.
• More undiagnosed or under-treated chronic conditions due to access gaps.

Put simply, if a population has more diabetes, more high blood pressure, and more
heart disease, it will have more severe COVID-19, even if genes were perfectly
equal. When you combine that with higher exposure risk from work and housing, you
get the tragic disparities we saw – without needing a single “South Asian gene” to
explain it.

So what role does the South Asian risk haplotype actually play?

The fairest way to summarize current evidence is this:

• The chromosome 3p21.31 haplotype is a real genetic signal that
  affects COVID-19 severity in some populations.
• It is more common in people of South Asian ancestry, so it may
  contribute somewhat to population-level risk.
• However, studies specifically within South Asian groups have found that this
  “major” risk factor does not consistently predict severe disease,
  suggesting that its effect is modest and context-dependent.
• Focusing on this haplotype alone misses the bigger drivers:
  chronic illnesses, vaccination gaps, occupational exposures, and structural
  inequality.

Think of the “South Asian gene” as one tile in a very large mosaic. It adds some
color to the picture, but it is not the frame, not the whole art piece, and
definitely not the wall it hangs on.

What this means if you have South Asian ancestry

The good news: you do not need a genetic test to start protecting yourself. Most of
the strongest risk factors for severe COVID-19 are visible and modifiable:

• How up to date you are with vaccination and boosters.
• Whether you have diabetes, high blood pressure, or heart disease under control.
• How quickly you can access testing and antiviral treatment if you get sick.
• What kind of work you do and how much protection you can use on the job.
• Whether you can ventilate and mask in crowded indoor spaces when cases rise.

If you’re South Asian, it is reasonable to treat COVID-19 as something to take
seriously – not because of a single gene, but because the combination of metabolic
risk, social factors, and possible genetic susceptibility means the margin for error
can be smaller. That’s an argument for extra prevention, not extra panic.

Practical steps for individuals, families, and communities

For individuals and families

• Know your numbers. Get checked for diabetes, blood pressure, and
  cholesterol – especially if you have a family history or South Asian ancestry.
• Stay current on vaccination. Even as policies change, vaccines
  remain one of the most powerful tools to prevent severe disease.
• Have a “COVID plan.” Know where you can get tested, who your
  doctor or clinic is, and how to access antivirals if you qualify.
• Use layers of protection when cases spike. Masks, ventilation,
  and avoiding packed indoor spaces still work, regardless of your genes.

For policymakers and health systems

• Target chronic disease prevention in communities with high rates
  of diabetes and heart disease – including many South Asian neighborhoods.
• Address structural barriers like overcrowded housing, lack of
  sick leave, and limited primary care access.
• Communicate with nuance. Avoid framing risk as “South Asians are
  genetically doomed.” Focus on actionable steps and community strengths.
• Invest in inclusive research. Continue enrolling diverse South
  Asian populations in genetic and clinical studies, rather than extrapolating from
  European-centric data.

Lived experiences behind the statistics

Data and p-values are useful, but they don’t tell you what it feels like
when “South Asian gene” headlines land in a real family’s WhatsApp group. To make
the science more human, it helps to look at composite experiences that mirror what
many families have gone through.

Imagine a multigenerational South Asian family living in a city like London, New
York, or Toronto. Grandparents share a house with their adult children and
grandchildren. One son works as a rideshare driver, another in a grocery store. For
months, they were the ones who kept everyone else’s food and transport running
while offices shut down.

During a winter wave, the younger workers can’t afford to stay home every time they
hear about another exposure. Shifts need to be covered, and the bills don’t stop
because a virus is circulating. Eventually, one of them comes home with a cough and
a positive test. Within days, nearly everyone in the household is infected.

The grandfather has type 2 diabetes and mild kidney disease. He’s been “too busy”
(his words) to see the doctor regularly, especially during the pandemic. His blood
sugar is not great, his blood pressure just okay. He doesn’t know anything about his
chromosome 3 haplotype. What decides his fate over the next ten days has more to do
with:

• How quickly the family recognizes his breathing is getting worse.
• Whether an overworked health system has space to see him.
• Whether he can get antivirals or oxygen in time.
• How well his chronic conditions were controlled before the infection.

Compare that with a different scenario: a South Asian physician in the same city.
She’s vaccinated, boosted, and has easy access to testing. She also carries the
“high-risk” haplotype, but she doesn’t know that either – because it’s not part of
routine clinical care. When she gets COVID-19 from a hospital exposure, she feels
terrible for a week but recovers at home.

On paper, both of these people might be labeled “South Asian with potential genetic
risk.” In reality, their outcomes diverge sharply because of age, chronic
conditions, vaccination status, and how quickly they can tap into care. The gene
signal is the same; the context is completely different.

Many community leaders and clinicians serving South Asian populations report a
similar pattern: families feel anxious when they hear about “genetic risk,” but they
are often much more empowered when conversations shift toward what can be changed –
from diet and exercise to vaccination, workplace protections, and advocacy for
better local health services.

There’s also an emotional side: the idea of a “South Asian gene” can feed stigma and
fatalism. Some may think, “It’s in our blood; what can we do?” That’s why it’s so
important to emphasize that genes are only one layer. You can’t edit your DNA at
home, but you can absolutely change your risk by tackling the modifiable pieces.

In that sense, the latest research – showing that this one genetic factor does not
fully explain COVID-19 susceptibility in South Asian populations – is quietly
liberating. It reminds us that while biology matters, it does not close the door on
prevention, equity, or hope.

Conclusion: more than a gene, less than destiny

The story of the “South Asian COVID gene” is a classic example of how complex
science gets flattened into a headline. Yes, there is a risk haplotype on chromosome
3 that likely came from Neanderthals and is more common in South Asian ancestry
groups. Yes, it contributes something to the risk of severe COVID-19.

But no, it does not fully explain why South Asian communities
around the world experienced higher infection and death rates. Newer research in
South Asian populations shows that this genetic factor is not a simple on/off switch
for severe disease. Instead, the real drivers are a mix of:

• Chronic conditions like diabetes, obesity, and heart disease.
• Age and vaccination status.
• Workplace and housing exposures.
• Access to timely, high-quality healthcare.
• A broader web of social and structural determinants.

That may be a less dramatic story than a single “dangerous gene,” but it’s better
news. If genes were destiny, there would be little we could do. Instead, the science
tells us that while genetics may load the dice a bit, what really decides the game
are the choices societies make about health systems, equity, and protection – and
the choices individuals make about prevention and care.

The post South Asian gene does not fully explain COVID-19 susceptibility appeared first on Global Travel Notes.