“…Additional tests for ETB are frequently negative, including negative skin PPD tests and pseudo-negative QuantiFERON-TB tests [12]. Although QuantiFERON TB-2G and immunebased blood assays, which do not require a specimen from the affected organ for microbiological or histological examination, may serve as alternative diagnostic tools [9,13,14]. Other TB diagnostic methods include serological tests by enzyme-linked immunosorbent assays (ELISA), which do not have sufficient sensitivity and specificity to be useful [15,16].…”