Antibody against Haemophilus influenzae protein D in patients with chronic conditions causing secondary immunodeficiency.
Prevalence of non-typeable Haemophilus influenzae (NTHi) in the etiology of invasive infections in immunocompromised individuals is increasing. Serum IgG antibody levels to H. influenzae protein D (PD) were significantly lower in adults suffering from chronic conditions causing secondary immunodeficiency (COPD, cancer, chronic renal failure, and diabetes) compared to age-matched healthy controls. A lack of naturally acquired antibody against this highly conserved antigen may contribute to an increased susceptibility to invasive NTHi disease. As COPD patients frequently infected with NTHi during disease exacerbations were unable to develop antibody response to PD, such defect could potentially contribute to the pathogenesis. Considering that pediatric PD-containing vaccines show protective effect against NTHi-caused otitis media, our data suggest the possibility of improving the defense against NTHi in COPD patients using immunization against PD. Although more research on the role of anti-PD antibody in protection against invasive NTHi disease is warranted, development of adult formulations of PD-based vaccines may be advantageous for prevention of severe infections in immunocompromised individuals.
Northern Ontario School of Medicine, Lakehead University, 955 Oliver Road, Thunder Bay, Ontario, 57B5E1, Canada.
N
N
Hawdon
B
B
Biman
W
W
McCready
M
M
Brigden
S
S
Malik
D
D
Vergidis
O
O
Kisselgoff
M
M
Ulanova
D000328:Adult; D000368:Aged; D000907:Antibodies, Bacterial / Q000097:blood* / Q000276:immunology; D001426:Bacterial Proteins / Q000276:immunology*; D002352:Carrier Proteins / Q000276:immunology*; D016022:Case-Control Studies; D002908:Chronic Disease; D005260:Female; D006192:Haemophilus Infections / Q000276:immunology* / Q000382:microbiology / Q000517:prevention & control*; D018073:Haemophilus Vaccines / Q000276:immunology*; D006193:Haemophilus influenzae / Q000187:drug effects / Q000276:immunology; D006801:Humans; D007110:Immunity, Active; D007114:Immunization; D016867:Immunocompromised Host; D007072:Immunoglobulin D / Q000276:immunology*; D007074:Immunoglobulin G / Q000097:blood / Q000276:immunology; D008074:Lipoproteins / Q000276:immunology*; D008297:Male; D008875:Middle Aged
D000907:Antibodies, Bacterial; D001426:Bacterial Proteins; D002352:Carrier Proteins; D018073:Haemophilus Vaccines; D007072:Immunoglobulin D; D007074:Immunoglobulin G; D008074:Lipoproteins; C067989:glpQ protein, Haemophilus influenzae