GPT and infection: A study on patients in China with asymptomatic COVID-19 revealed that they had relatively lower levels of serum alanine aminotransferase (ALT) and C-reactive protein.41 Previously, it has been shown that ALT may correlate negatively with T cell and natural killer cell activity.42 This then supports the suggestion that in individuals with asymptomatic infection, there may be a sharper cell-mediated innate response which significantly moderates the progression to a pro-inflammatory, adaptive immune response.