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There is so much negativity in the news about COVID-19, we want to give you all the positive good news that is happening with research, clinical trials, improvements and anything that we can be positive about that you may not have seen.

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Cytokine storms and T cell counts may offer clues on how to treat COVID-19

7/4/2020

 
Cytokine storms may affect the severity of COVID-19 cases by lowering T cell counts, according to a new study published in Frontiers in Immunology. Researchers studying coronavirus cases in China found that sick patients had a significantly low number of T cells, a type of white blood cell that plays a crucial role in immune response, and that T cell counts were negatively correlated with case severity.

Interestingly, they also found a high concentration of cytokines, a protein that normally helps fight off infection. Too many cytokines can trigger an excessive inflammatory response known as a cytokine storm, which causes the proteins to attack healthy cells. The study suggests that coronavirus does not attack T cells directly, but rather triggers the cytokine release, which then drives the depletion and exhaustion of T cells.

The findings offer clues on how to target treatment for COVID-19, which has become a worldwide pandemic and a widespread threat to human health in the past few months. “We should pay more attention to T cell counts and their function, rather than respiratory function of patients,” says author Dr. Yongwen Chen of Third Military Medical University in China, adding that “more urgent, early intervention may be required in patients with low T lymphocyte counts.”

Authors examined 522 patients with coronavirus along with 40 healthy controls. All patients studied were admitted to two hospitals in Wuhan, China between December 2019 and January 2020, and ages ranged between 5 days and 97 years old. Of the 499 patients who had their lymphocytes recorded, 76% had significantly low total T cell counts. ICU patients had significantly lower T cell counts compared with non-ICU cases, and patients over the age of 60 had the lowest number of T cells.

Importantly, the T cells that did survive were exhausted and could not function at full capacity. Not only does this have implications for COVID-19 patient outcomes, but T cell exhaustion leaves patients more vulnerable to secondary infection and calls for scrupulous care.

https://blog.frontiersin.org/2020/05/01/cytokine-storms-and-t-cell-counts-may-offer-clues-on-how-to-treat-covid-19

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