MMP9 and tuberculosis: Azikin et al evaluated the levels of MMP‐9 in children who lived in the same house with a person having active TB.45 There were no significant differences between the expression levels of MMP‐9 in the group of exposed and Mtb infected children, and the levels of MMP‐9 were not influenced by sex, age, nutritional status and the status of BCG immunization.