AMID the steady stream of stories on the lives lost to coronavirus are cases that stand out as remarkable. In the past month, at least two pairs of twins have died in Britain and two pairs of brothers, all within hours or days of each other. But do the deaths point to genetic factors that make some more likely than others to succumb to the disease?

Most scientists believe that genes play a role in how people respond to infections. A person’s genetic makeup may influence the receptors that the coronavirus uses to invade human cells. How resilient the person is to the infection, their general health, and how the immune system reacts will also have some genetic component.

A team led by Professor Tim Spector, head of twin research and genetic epidemiology at King’s College London, has reported that COVID-19 symptoms appear to be 50 percent genetic. But Spector said more work is needed to understand which genes are involved and what difference they make to the course of the disease. “We don’t know if there are genes linked to the receptors or genes linked to how the infection presents,” he said.

Identical twins Katy and Emma Davis, aged 37, died at Southampton general hospital last month. The sisters, who lived together, had underlying health problems and had been ill for some time before they contracted the virus. Another pair of twins, Eleanor Andrews and her sister Eileen, aged 66, died earlier this month. They too lived together and had underlying health conditions.

Two brothers from Newport, Ghulam Abbass, 59, and Razza Ghulam, 53, died within hours of each other at Royal Gwent hospital. Another pair of brothers from Luton, Olume Ivowi, 46, and Isi Ivowi, 38, died within days of each other.

“These deaths alert people to the fact that this could be genetic, but when people live together they share an environment as well,” Spector said. The upshot is that twins who live together are more likely to have similar lifestyles and behaviors, from diet and exercise habits to how quickly they seek medical care. Twins are not generally less healthy than the wider population.

Marcus Munafo, professor of biological psychiatry at Bristol University, said reports of twin deaths must be interpreted with caution.

“When twins or siblings tragically die with COVID-19 that captures our attention, but that doesn’t mean there is any particular reason to think twins or siblings are at greater risk.”(SD-Agencies)