Antibodies and Memory Cells Role After Different Pneumococcal Vaccines in HIV Adults

Study Overview
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Brief Summary
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Streptococcus pneumoniae is a cause of high morbidity and mortality in HIV-positive subjects, representing the leading etiological agent of severe bacterial pneumonia. International guidelines recommend that HIV positive patients aged >=19 years, who are 13-valent conjugate vaccine (PCV13) naïve, should receive a single dose of PCV13. Pneumococcal polysaccharide vaccine 23-valent (PPV23) should be given >=8 weeks after indicated dose of PCV13, and a second dose of PPV23 should be given 5 years later. For those who previously received PPV23, PCV13 should be administered >=1 year after the last PPV23 dose. HIV infection affects humoral immunity both through reduced T-cell help and changes in the B-cell compartment. Neither amount of circulating memory B cells nor their functions are restored by antiretroviral therapy: this may affect antibody mediated immunity, even in well-treated HIV patients. In asplenic childrens a single dose of PCV13 seems sufficient to restore the pool of anti-pneumococcal polysaccharides IgG memory B cells. In adults, it has been reported that a single dose of 7-valent pneumococcal conjugate vaccine induces significant increases in serotype-specific memory B-cell populations, conversely, immunization with PPV23 seems to decrease memory B-cell frequency. However, data on immunological response after PCV13 in HIV positive adults are still scanty and the optimal pneumococcal prophylaxis strategy needs further investigation. Number of PCV13 doses is actually demanded to clinical judgment for each patient; also current Italian indications recommend at least one dose, but till 3 doses seem to be suggested for immunocompromised patients. Present study aims to investigate short and long term immunological response after different standard vaccine schedule and to evaluate pneumococcal nasopharyngeal colonization in vaccinated patients.

Detailed Description
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The study will be divided in 3 main aims; in the first, the long term immunological response to PCV13 and PPV23 in HIV+ adults will be evaluated. In a previous clinical trial (PRIN 2009 study, Clinicaltrials: NCT02123433) a cohort of HIV positive adults had been vaccinated either with 2 doses of PCV13 8 weeks apart or 1 dose of PPV23 (last enrollment: December 2012). Immunoglobulins G (IgGs) against 12 common pneumococcal serotypes included in PCV13 and PPV23 were quantified by ELISA at baseline (BL), 8, 24 and 48 weeks: analysis are still ongoing; preliminary data revealed that both vaccines were safe and well tolerated and showed similar immunogenicity. The present study aims to evaluate persistence of long term (>= 3 years) serological and memory B cells response in those previous vaccinated groups. In this phase, population will be screened for inclusion and exclusion criteria to entire study conduction. Once obtained informed consent, patients will be enrolled. Together with the collection of blood samples for routine purposes, an additional blood sample will be taken so to run immunological tests (ELISA, ELISpot). It is important to underline that no invasive procedures are needed for the study, apart from routine clinical practice: blood specimens will be obtained as part of routine investigations, blood will be hence taken for CD4+ cell count, viraemia analysis and anti-HIV drug monitoring; enrolled patients will agree just to donate a blood sample for research purposes. Blood samples will be collected from all previously PCV13 or PPV23 vaccinated HIV+ subjects and serum antibodies and B cells isotypes will be analyzed at baseline (BL), that is >= 3 years after a previous PCV13 or PPV23 vaccination. The second objective of this study aims to evaluate short and long term immunological response with different combined vaccine strategies in HIV+ adults. Participants will be recruited if they'll have needed to receive antipneumococcal vaccines (primary or booster) according to clinical standard indications. Elicited immunological response (serum antibodies and B cells isotypes) will be explored at BL, 8, 24, 48 and 96 weeks after additional different received pneumococcal vaccine strategies. At BL, after collecting blood samples as previously described for Aim1, every patient will be assigned to a specific Group on the basis of the received vaccine schedule, prescribed by clinicians according to individual clinical indications. Short- (30 minutes), medium- (<=5 days) and long-term adverse reactions will be reported, by clinical evaluation within 30 minute post-vaccine, phone call at day 5 and anamnestic data collection during follow up 8, 24, 48 and 96 weeks. Blood samples will be analyzed at 8, 24, 48 and 96 weeks to evaluate serum antibodies and B cells isotypes. Finally, the third aim of the study will lead an epidemiological and microbiological survey in vaccinated HIV+ adults. At BL, 8, 24, 48 and 96 weeks all clinical-anamnestic data will be updated, together with blood sample analysis to title IgG towards each vaccinal pneumococcal polysaccharides and to evaluate B cells isotypes and nasopharyngeal swab for S. pneumoniae culture, in vitro chemosusceptibility tests, serotyping, clonal analysis by Multilocus Locus Sequence Typing (MLST). Carriage will be defined as S. pneumoniae isolation from one or more of the nasal swabs, in absence of any clinical signs or symptoms; a 12 months clinical follow up will be performed in colonized patients. All patients developing infections will be followed until resolution.

Official Title
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Long Term Serological Response and Memory Cells Role After Different Pneumococcal Vaccine Strategies in HIV Adults

Conditions
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HIV, Pneumococcal Infections

Intervention / Treatment
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* Other: Evaluation of immunological response
* Other: Nasopharyngeal swabs analysis


Participation Criteria
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Eligibility Criteria
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Inclusion Criteria: age between 18 and 65 years acceptance of informed consensus HIV positivity access to structures in ambulatory or Day Hospital regimen CD4+ cell count > or < than 200 cells/ul subjects for which Italian Ministry of Health recommend pneumococcal vaccination with PCV13 or PPV23 Exclusion Criteria: pregnancy acute infectious disease ongoing antibiotic therapy ongoing in the previous 7 days HIV-independent immunodepression chronic steroid therapy anatomic or functional asplenia contraindication to vaccination based on package insert drug facts, such as hypersensitivity to the active ingredient or one of the bulking agents (PPV23, Pneumovax);hypersensitivity to the active ingredient, to one of the bulking agents or to the diphteria toxoid (PCV13, Prevenar 13)

Ages Eligible for Study
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Minimum Age: 18 Years
Maximum Age: 65 Years

Sexes Eligible for Study
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All

Accepts Healthy Volunteers
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No

Study Plan
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How is the study designed?
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Arms and Interventions

| Participant Group/Arm | Intervention/Treatment |
| --- | --- |
| Group 1<br>Immunological and microbiological status of HIV- positive adults with pneumococcal vaccinal status of 2 PCV13 doses received from more than 3 years that have prescription for a single booster dose of PCV13. | Other: Evaluation of immunological response<br>* Study of short and long term immunological response after different schedule of PCV13 or PPV23<br>Other: Nasopharyngeal swabs analysis<br>* Evaluation of pneumococcal nasopharyngeal colonization<br>|
| Group 2<br>Immunological and microbiological status of HIV- positive adults with pneumococcal vaccinal status of 1 PPV23 dose received from more than 3 years that have prescription to receive 2 doses (priming + boost) of PCV13. | Other: Evaluation of immunological response<br>* Study of short and long term immunological response after different schedule of PCV13 or PPV23<br>Other: Nasopharyngeal swabs analysis<br>* Evaluation of pneumococcal nasopharyngeal colonization<br>|
| Group 3<br>HIV- positive adults that have never received a pneumococcal vaccine (naive) and have a CD4+ cell count < 200 cells/ul that have prescription to be primed with a single dose of PCV13 then boosted with a single dose of PPV23. | Other: Evaluation of immunological response<br>* Study of short and long term immunological response after different schedule of PCV13 or PPV23<br>Other: Nasopharyngeal swabs analysis<br>* Evaluation of pneumococcal nasopharyngeal colonization<br>|
| Group 4<br>Immunological and microbiological status of HIV- positive adults that have never received a pneumococcal vaccine (naive) and have a CD4+ cell count > 200 cells/ul that have prescription to be primed with a single dose of PCV13 then boosted with a single dose of PPV23. | Other: Evaluation of immunological response<br>* Study of short and long term immunological response after different schedule of PCV13 or PPV23<br>Other: Nasopharyngeal swabs analysis<br>* Evaluation of pneumococcal nasopharyngeal colonization<br>|
| Group 5<br>Immunological and microbiological status of HIV- positive adults with pneumococcal vaccinal status of 1 PPV23 dose received from more than 3 years and that that have prescription to receive a single dose of PCV13. | Other: Evaluation of immunological response<br>* Study of short and long term immunological response after different schedule of PCV13 or PPV23<br>Other: Nasopharyngeal swabs analysis<br>* Evaluation of pneumococcal nasopharyngeal colonization<br>|

What is the study measuring?
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Primary Outcome Measures

| Outcome Measure | Measure Description | Time Frame |
| --- | --- | --- |
| Immunological response evaluation | Dosing of serotype specific antibodies (cut off value: 0.35 mcg/mL for each vaccine polysaccharide antigen) and quantification of number and phenotype of serotype specific B cells | 24 months | 

Secondary Outcome Measures

| Outcome Measure | Measure Description | Time Frame |
| --- | --- | --- |
| Streptococcus pneumoniae colonization | Presence of S. pneumoniae in nasopharyngeal swabs culture | 24 months | 

 Terms related to the study
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Keywords Provided by Centre Hospitalier Valida
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Pneumococcal vaccine, HIV infection, 13-valent Pneumococcal Conjugate Vaccine, 23-valent Pneumococcal Polysaccharide Vaccine