Cytokine biomarkers of exacerbations in sputum from Chronic Obstructive Pulmonary Disease patients: a prospective cohort study.

BACKGROUND: We determined the relationships between cytokine expression in sputum and clinical data to characterise and understand Chronic Obstructive Pulmonary Disease (COPD) exacerbations in COPD patients. METHODS: We measured 30 cytokines in 936 sputum samples, collected at stable state (ST) and exacerbation (EX) visits from 99 participants in the Acute Exacerbation and Respiratory InfectionS in COPD (AERIS) study (NCT01360398, www.clinicaltrials.gov). We determined their longitudinal expression and examined differential expression based on disease status or exacerbation type. RESULTS: Of the cytokines, 17 were suitable for analysis. As for disease states, in EX sputum samples, IL-17A, TNF-α, IL-1ß, and IL-10 were significantly increased compared to ST sputum samples, but a logistic mixed model could not predict disease state. As for exacerbation types, bacteria-associated exacerbations showed higher expression of IL-17A, TNF-α, IL-1ß, and IL-1α. IL-1α, IL-1ß, and TNF-α were identified as suitable biomarkers for bacteria-associated exacerbation. Bacteria-associated exacerbations also formed a cluster separate from other exacerbation types in principal component analysis. CONCLUSIONS: Measurement of cytokines in sputum from COPD patients could help identify bacteria-associated exacerbations based on increased concentrations of IL-1α, IL-1ß, or TNF-α. This finding may provide a point-of-care assessment to distinguish a bacterial exacerbation of COPD from other exacerbation types.

The Incidence of Skin and Soft Tissue Infections in the United States and Associated Healthcare Utilization Between 2010 and 2020.

Background: The number of patients with skin and soft tissue infections (SSTIs) in the United States appeared to be increasing well into the 21st century. However, no recent data have confirmed this trend. Methods: This retrospective, observational cohort study used claims data over 11 years (2010-2020) from Optum's de-identified Clinformatics Data Mart Database. SSTI episodes, complications, and comorbidities were identified using International Classification of Diseases codes. Annual SSTI incidence rates, proportions of recurrent SSTI, SSTI-associated deaths, and total costs were estimated. Results: During the study period, 5.4 million patients experienced 9.1 million SSTI episodes, with an incidence of 77.5 (95% confidence interval, 77.4-77.5) per 1000 person-years of observation (PYO). Annual incidence did not change significantly over time. Overall incidence (per 1000 PYO) of SSTI episodes in patients without comorbidities was 32.1 (highest incidence was for previous SSTI [113.5]) versus much higher rates if comorbidities were present. Incidence rates (per 1000 PYO) of chronic ulcers increased over time from 11.3 to 18.2 (P < .0001) and complicated disease from 3.5 to 6.3 (P < .0001). Deaths occurring within 30 days post-SSTI hospitalization rose from 2.6% to 4.6% in 2020. Recurrences occurred in 26.3% of index cases. The mean cost of an SSTI episode was US$3334 (median US$190) and was highest for surgical site infections and chronic ulcers. Conclusions: The epidemiology of SSTI in the United States is changing and the disease burden is increasing despite stabilization in overall incidence. These data can inform identification of priority populations who could benefit from targeted interventions.

Lung mucosal immunity to NTHi vaccine antigens: Antibodies in sputum of chronic obstructive pulmonary disease patients.

Chronic obstructive pulmonary disease (COPD) is a common chronic respiratory illness in older adults. A major cause of COPD-related morbidity and mortality is acute exacerbation of COPD (AECOPD). Bacteria in the lungs play a role in exacerbation development, and the most common pathogen is non-typeable Haemophilus influenzae (NTHi). A vaccine to prevent AECOPD containing NTHi surface antigens was tested in a clinical trial. This study measured IgG and IgA against NTHi vaccine antigens in sputum. Sputum samples from 40 COPD patients vaccinated with the NTHi vaccine were collected at baseline and 30 days after the second dose. IgG and IgA antibodies against the target antigens and albumin were analyzed in the sputum. We compared antibody signals before and after vaccination, analyzed correlation with disease severity and between sputum and serum samples, and assessed transudation. Antigen-specific IgG were absent before vaccination and present with high titers after vaccination. Antigen-specific IgA before and after vaccination were low but significantly different for two antigens. IgG correlated between sputum and serum, and between sputum and disease severity. Sputum albumin was higher in patients with severe COPD than in those with moderate COPD, suggesting changes in transudation played a role. We demonstrated that immunization with the NTHi vaccine induces antigen-specific antibodies in sputum. The correlation between IgG from sputum and serum and the presence of albumin in the sputum of severe COPD patients suggested transudation of antibodies from the serum to the lungs, although local IgG production could not be excluded.Clinical Trial Registration: NCT02075541.

What is the context? Chronic obstructive pulmonary disease (COPD) is the most common chronic respiratory illness in older adults and the third leading cause of death worldwide.One bacterium in the lungs, non-typeable Haemophilus influenzae (NTHi), is responsible for acute exacerbation of the disease, characterized by an increase in airway wall inflammation and symptoms, leading to high morbidity and mortality.A vaccine targeting NTHi was previously developed but did not show efficacy in reducing exacerbations in COPD patients, probably because the vaccine did not elicit an immune response in the lung mucosae, where the bacteria are located.What is the impact? Parenteral immunization with new vaccines targeting NTHi is able to elicit immune defense at the level of lung mucosae.Now that antibodies can be measured in sputum, new vaccines against COPD exacerbations or other lung infections can be tested for efficacy in the actual target tissue.Also, lung immunity against specific pathogens can now be tested.What is new? We determined that antigen-specific antibodies were present in the lungs after vaccination; these were assessed in sputum after vaccination with NTHi surface antigens.NTHi-specific IgG were present in the lungs and appeared to have arrived there primarily by transudation, a type of leakage from the serum to the lung mucosae.Transudation appeared to be stronger in severe than in moderate COPD patients.

Safety and immunogenicity of an intramuscular Helicobacter pylori vaccine in noninfected volunteers: a phase I study.

INTRODUCTION: Helicobacter pylori infection is among the most common human infections and the major risk factor for peptic disease and gastric cancer. Immunization with vaccines containing the H pylori vacuolating cytotoxin A (VacA), cytotoxin-associated antigen (CagA), and neutrophil-activating protein (NAP), alone or in combination, have been shown to prevent experimental infection in animals. AIM: We sought to study the safety and immunogenicity of a vaccine consisting of recombinant VacA, CagA, and NAP given intramuscularly with aluminium hydroxide as an adjuvant to noninfected healthy subjects. METHODS: This controlled, single-blind Phase I study randomized 57 H pylori-negative volunteers into 7 study arms exploring 2 dosages (10 and 25 microg) of each antigen and 3 schedules (0, 1, 2 weeks; 0, 1, 2 months; and 0, 1, 4 months) versus alum controls. All participants were followed for 5 months. Thirty-six subjects received a booster vaccination 18-24 months after the completion of the primary vaccination. RESULTS: Local and systemic adverse reactions were mild and similar in placebo and vaccine recipients on the monthly schedules. All subjects responded to 1 or 2 of the antigens and 86% of all vaccines mounted immunoglobulin G antibody responses to all 3 antigens. Vaccinees exhibited an antigen-specific cellular response. Vaccination 18-24 months later elicited anamnestic antibody and cellular responses. CONCLUSIONS: This intramuscular H pylori vaccine demonstrated satisfactory safety and immunogenicity, produced antigen-specific T-cell memory, and, therefore, warrants further clinical study.

A phase I, randomized, controlled, dose-ranging study of investigational acellular pertussis (aP) and reduced tetanus-diphtheria-acellular pertussis (TdaP) booster vaccines in adults.

Despite high vaccination coverage worldwide, pertussis has re-emerged in many countries. This randomized, controlled, observer-blind phase I study and extension study in Belgium (March 2012-June 2015) assessed safety and immunogenicity of investigational acellular pertussis vaccines containing genetically detoxified pertussis toxin (PT) (NCT01529645; NCT02382913). 420 healthy adults (average age: 26.8 ± 5.5 years, 60% female) were randomized to 1 of 10 vaccine groups: 3 investigational aP vaccines (containing pertussis antigens PT, filamentous hemagglutinin [FHA] and pertactin [PRN] at different dosages), 6 investigational TdaP (additionally containing tetanus toxoid [TT] and diphtheria toxoid [DT]), and 1 TdaP comparator containing chemically inactivated PT. Antibody responses were evaluated on days 1, 8, 30, 180, 365, and approximately 3 years post-booster vaccination. Cell-mediated immune responses and PT neutralization were evaluated in a subset of participants in pre-selected groups. Local and systemic adverse events (AEs), and unsolicited AEs were collected through day 7 and 30, respectively; serious AEs and AEs leading to study withdrawal were collected through day 365 post-vaccination. Antibody responses against pertussis antigens peaked at day 30 post-vaccination and then declined but remained above baseline level at approximately 3 years post-vaccination. Responses to FHA and PRN were correlated to antigen dose. Antibody responses specific to PT, toxin neutralization activity and persistence induced by investigational formulations were similar or significantly higher than the licensed vaccine, despite lower PT doses. Of 15 serious AEs, none were considered vaccination-related; 1 led to study withdrawal (premature labor, day 364; aP4 group). This study confirmed the potential benefits of genetically detoxified PT antigen. All investigational study formulations were well tolerated.

Mutants of the Escherichia coli heat-labile enterotoxin as safe and strong adjuvants for intranasal delivery of vaccines.

Cholera toxin and Escherichia coli heat-labile enterotoxin are powerful mucosal adjuvants but their high toxicity hampers their use in humans. Site-directed mutagenesis has allowed the generation of several cholera toxin and E. coli heat-labile enterotoxin mutants with abolished or strongly reduced toxicity that still retain strong mucosal adjuvanticity. Among them, LTK63 (Ser to Lys substitution at position 63 in the A subunit) is completely nontoxic and LTR72 (Ala to Arg at position 72) retains a very low residual enzymatic activity. Both of them have been shown to be safe and effective in enhancing the immunogenicity of intranasally coadministered vaccines, also resulting in protective responses in several animal models. Clinical grade preparations of these mutants have now been produced, tested in animals and proven to be totally safe. Indeed, they did not induce any inflammatory event in the respiratory tract nor, more importantly, in the olfactory bulbs and in the meninges. The fully nontoxic LTK63 mutant has now been successfully tested in human volunteers with a trivalent subunit influenza vaccine.

Safety and immunogenicity of a new fully liquid DTPw-HepB-Hib combination vaccine in infants.

We assessed the safety and immunogenicity of a fully liquid, DTPw-HepB-Hib combination vaccine (Quinvaxem) in comparison with separately administered DTPw-Hib and hepatitis B vaccines. Infants participating in this open-label, randomized, phase II study received a primary vaccination course using a 2-3-4 month schedule. Blood samples were taken immediately prior to the first and one month after the third vaccination. Adverse events were assessed over a 7-day post-vaccination period using subject diaries. After completion of the primary vaccination course, 94.7% [95% CI: 89.8-97.7%] of infants receiving the combination vaccine achieved protective anti-HBs antibody titers (> or = 10 mIU/mL) with a mean 39-fold increase in GMTs in comparison with 99.3% [95% CI: 96.3-100%] seroprotection and a mean 29-fold GMT increase in the comparator group. Diphtheria, tetanus and Haemophilus influenzae type b (Hib) seroprotection rates and pertussis seroconversion rates were also similar between the two groups. There was no statistically significant difference in GMTs for diphtheria between the two groups, but significant differences were shown for tetanus, Hib, and pertussis with higher GMTs for each antigen observed in the comparator group. The combination vaccine was well tolerated, with fever (body temperature > or = 38 degrees C) being the most frequently reported adverse event in both the DTPw-HepB-Hib (12.5% [95% CI: 7.7-18.8%]) and comparator (12.6% [95% CI: 7.7-19.0%]) groups. This study demonstrated that the fully liquid DTPw-HepB-Hib combination vaccine has safety and immunogenicity profiles similar to the DTPw-Hib and hepatitis B vaccines when administered separately.

A preliminary evaluation of alternative adjuvants to alum using a range of established and new generation vaccine antigens.

Although alum is the most commonly used vaccine adjuvant, it has some limitations for use with the next generation recombinant antigens. We explored the use of alternative adjuvant formulations (poly lactide co-glycolide (PLG) microparticles, MF59 emulsion, CAP and l-tyrosine suspension) in comparison with five different vaccine antigens--namely, diphtheria toxoid (DT), tetanus toxoid (TT), HBsAg, Men C conjugate and MB1. The results indicated that although alum was optimal for bacterial toxoid based vaccines, it was not highly potent for MB1, Men C or HBsAg antigens. MF59 emulsion stood out as a good alternative to alum for TT, HBsAg, MB1 and Men C vaccines. On the other hand l-tyrosine suspension and CAP did not enhance immune responses over alum with most antigens. PLG microparticles were comparable or better than alum with both MB1 and Men C conjugate vaccine. The study indicates that it is possible to replace alum with other adjuvant formulations like MF59 and PLG and maintain and/or improve immune responses with some vaccine antigens.

A universal vaccine for serogroup B meningococcus.

Meningitis and sepsis caused by serogroup B meningococcus are two severe diseases that still cause significant mortality. To date there is no universal vaccine that prevents these diseases. In this work, five antigens discovered by reverse vaccinology were expressed in a form suitable for large-scale manufacturing and formulated with adjuvants suitable for human use. The vaccine adjuvanted by aluminum hydroxide induced bactericidal antibodies in mice against 78% of a panel of 85 meningococcal strains representative of the global population diversity. The strain coverage could be increased to 90% and above by the addition of CpG oligonucleotides or by using MF59 as adjuvant. The vaccine has the potential to conquer one of the most devastating diseases of childhood.

Double-blind study comparing the immunogenicity of a licensed DTwPHib-CRM197 conjugate vaccine (Quattvaxem) with three investigational, liquid formulations using lower doses of Hib-CRM197 conjugate.

We performed a double-blind clinical study to evaluate the safety and immunogenicity of four formulations of a DTwPHib full liquid vaccine, three of which contained fractional doses of the 10 microg-dose of CRM197-Hib conjugate vaccine. A total of 261 infants were enrolled and randomised to receive at 3, 4 and 5 months of age, in a double-blind fashion, one of the four DTwPHib vaccine formulations containing 10, 5, 2.5 or 1.25 microg of CRM197-Hib conjugate. Post-immunization reactions were similar in the four vaccine groups, they were mild, transient and resolved without sequelae. The seroconversion rates to anti-PRP titres > or = 0.15 microg/mL were 100%, 98%, 97% and 98% in the groups 10, 5, 2.5 and 1.25 microg, respectively. The seroconversion rates to anti-PRP titres > or =1 microg/mL were 95%, 97%, 88% and 90%, again respectively. Anti-PRP GMTs were 18, 17, 7.82 and 6.94 microg/mL, respectively. All subjects were protected against tetanus and diphtheria, and >80% seroconverted to pertussis. High, and similar, levels of anti-PRP GMTs were elicited by the formulations with 10 and 5 microg of CRM197-Hib conjugate. Although the formulations with 2.5 and 1.25 microg of CRM197-Hib elicited lower levels of anti-PRP GMTs, they were immunogenic and are possible candidates for further development.