ABC	ATP-binding cassette
BBB	Blood–brain barrier
BCSFB	Blood–cerebrospinal fluid barrier
BMEC	Brain microvascular endothelial cells
CBP	CERB-binding protein
CbpA	Choline-binding protein A
CECAM	Carcinoembryonic antigen-related cellular adhesion molecule
ChoP	Phosphorylcholine
CNF1	Cytotoxic necrotizing factor 1
CNS	Central nervous system
CP	Choroid plexus
EGFR	Epidermal growth factor receptors
ERK	Extracellular signal-regulated kinases
FAK	Focal adhesion kinase
GCH1	Guanosine triphosphate cyclohydrolase
GlpO	α-glycerophosphate oxidase
HBMECs	Human brain microvascular endothelial cells
HIBCPP	Human choroid plexus epithelial papilloma
HvgA	Hypervirulent GBS adhesin
iagA	invasion associated gene A
Inl	Internalin
JNK	c-JUN N-terminal kinases
LLO	Listeriolysin O
LOS	Lipooligosaccharide
LOX 1	Lipoprotein receptor 1
LPS	Lipopolysaccharide
LTA	Lipoteichoic acid
MAPK	Mitogen activated protein kinase
MIF	Macrophage migration inhibitory factor
MMP	Matrix metalloproteinase
Nad A	Neuraminidase A
NadA	Neisseria adhesin A
NF-κB	Nuclear factor κB
NO	Nitric oxide
NOD2	Nucleotide-binding oligomerization domain 2
OMV	Outer membrane vesicles
PAFR	Platelet-activating factor receptor
PAMPs	Pathogen-associated molecular patterns
PCPEC	Primary porcine CP epithelial cells
PDGF-B	Platelet-derived growth factor-B
PECAM	Platelet endothelial cell adhesion molecule
PI3K	Phosphatidylinositol 3-kinase
PKC	Protein kinase C
plgR	Polymeric immunoglobulin receptor
PMN	Polymorphnuclear neutrophils
PPRs	Pattern recognition receptors
PTX	Pertussis toxin-sensitive
Ssr	Serine-rich repeat
T3SS	Type three secretion system
TF	Transcription factor
TGF-β	Transforming growth factor-β
TJs	Tight junctions
TNF	Tumor necrosis factor
VEGF	Vascular Endothelial Growth Factor
GBS	Group B streptococcus, Streptococcus agalactiae
E. coli	Escherichia coli
H. influenzae	Haemophilus influenzae
Hia	H. influenzae serotype a
Hib	H. influenzae serotype b
Hif	H. influenzae serotype f
L. monocytogenes	Listeria monocytogenes
N. meningitidis	Neisseria meningitidis
NTHi	nontypeable H. influenzae
S. pneumoniae	Streptococcus pneumoniae
S. suis	Streptococcus suis