New research has found that a specific enzyme called Regnase-1 plays a crucial role in how our immune system responds to the COVID-19 virus. The study discovered that mice with reduced levels of this enzyme were more resistant to infection and developed less severe pneumonia, suggesting that Regnase-1 helps regulate the immune response to prevent excessive inflammation. In particular, the researchers found that neutrophils, a type of white blood cell, were affected by the lack of Regnase-1, leading to an overactive response that could exacerbate the disease.