U-exo	small extracellular vesicles derived from human umbilical cord mesenchymal stem cells
IFV	human influenza A/B virus
HCoV	human seasonal coronavirus
IFN-α	interferon-alpha protein
ALI	air-liquid interface
SARS-CoV-2	severe acute respiratory syndrome coronavirus 2
MERS-CoV	middle east respiratory syndrome coronavirus
SARS-CoV-1	severe acute respiratory syndrome coronavirus 1
EVs	extracellular vesicles
miRNAs	microRNAs
MSCs	mesenchymal stem cells
HCV	Hepatitis C virus
UCMSCs	umbilical cord-derived mesenchymal stem cells
HNECs	primary human nasal epithelial cells
A549	human lung adenocarcinoma cells
HCT8	human colorectal adenocarcinoma cells
MRC5	human lung embryonic fibroblast cells
NS1	non-structural protein 1
IFV-PR8delNS1	Human influenza virus A/Puerto-Rico/8/34 PR8 lacking NS1
MOI	multiplicity of infection
TCID50	tissue culture infectious dose
hpi	hours post-infection
NTA	Nanoparticle Tracking Analysis
TEM	transmission electron microscopy
MTT	3-(4, 5-dimethylthiazolyl-2)-2,5-diphenyltetrazolium bromide
LDH	lactate dehydrogenase
GAPDH	Glyceraldehyde 3-phosphate dehydrogenase
DAPI	4,6-diamidino-2-phenylindole
TEER	trans-epithelial electrical resistance
H&E	hematoxylin and eosin
CM	Conditioned medium
HBV	Hepatitis B virus
sEVs	small EVs
RLR	retinoic acid-inducible gene I-like receptors
RIG-I	retinoic acid-inducible gene-I
MDA5	melanoma differentiation associated gene 5
MAVS	mitochondrial antiviral signaling protein
STING	stimulator of interferon response c-GAMP interactor 1
Mx1	MX dynamin like GTPase 1
ISG15	interferon-stimulated gene 15
OAS1	2’-5’-oligoadenylate synthetase 1
IFITM3	interferon induced transmembrane protein 3
IFN-β	interferon-beta
IFN-λ1	interferon-lambda 1
ISGs	interferon-stimulated genes
JAK/STAT	Janus kinase/signal transduction and activator of transcription signaling pathways