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‘Sex difference in immune response to COVID-19 decoded’

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Women with COVID-19 mount a more robust and sustained immune response via the body’s T cells than men, according to a study that may help guide a sex-based approach to the treatment and care for those infected with the novel coronavirus.

The research, published in the journal Nature, assessed 98 patients — aged 18 years or over — admitted to the Yale-New Haven Hospital in the US with mild to moderate disease, who had confirmed positive tests for novel coronavirus infection.

While previous research had shown that the severity of COVID-19 tends to be higher for men than for women, the underlying reasons for this discrepancy have remained unclear, according to the scientists, including those from Yale University in the US.

In the current study, they found that female patients mounted a more robust and sustained immune response via the body’s T cells than men.

The researchers noted that T cells played an essential part in the immune system with their roles including the killing of infected cells.

According to the scientists, including Akiko Iwasaki from the Yale University School of Medicine, poor T cell responses correlated with a worse disease outcome in male patients.

“We found that a poor T cell response negatively correlated with patients’ age, and was associated with worse disease outcomes in male patients, but not in female patients,” the researchers wrote in the study.

Compared with healthy control individuals, they said patients with COVID-19 were found to have elevated levels of innate immune cytokines and chemokines, which are signaling molecules involved in the recruitment of immune cells to sites of inflammation.

However, the study noted that the levels of some of these molecules were higher in male patients than in female patients.

In female patients, the scientists said, higher levels of the cytokine molecules were associated with worse disease response.

Based on the results, they said male patients may benefit from therapies that elevate T cell responses whereas female patients may benefit from therapies that dampen early innate immune responses.

However, scientists caution that they were unable to rule out other underlying factors that may modify the risk of poor outcomes in male and female patients with COVID-19.

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