AECOPD	Acute Exacerbations of Chronic Obstructive Pulmonary Disease
AFS	Acid-fast staining
AUC	Area Under the Curve
BALF	Bronchoalveolar lavage fluid
BMI	Body mass index
CI	Confidence interval
COPD	Chronic obstructive pulmonary disease
CRP	C-reactive protein
FDP	Fibrin(ogen) Degradation Products
GOLD	Global Initiative for Chronic Obstructive Lung Disease
IGRA	Interferon-gamma release assays
IL-6	Interleukin-6
mNGS	Metagenomic next-generation sequencing
MTB	Mycobacterium tuberculosis
NK cell	Natural killer cell
FOR	Odds ratio
PCT	Procalcitonin
qPCR	Real-time quantitative polymerase chain reaction
RIF	Rifampicin
SMRN	Stringently mapped read number
AST	Aspartate aminotransferase
Crea	Creatinine
ICU	Intensive care unit
T Cell	T lymphocyte
TB	Tuberculosis
WBC	White blood cell