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. 2004;2004(1):CD003885.
doi: 10.1002/14651858.CD003885.pub2.

Pneumococcal vaccines for sickle cell disease

Affiliations

Pneumococcal vaccines for sickle cell disease

E G Davies et al. Cochrane Database Syst Rev. 2004.

Abstract

Background: People with sickle cell disease are particularly susceptible to pneumococcal infection, which may be fatal. Infants (children aged up to 23 months) are at particularly high risk, but conventional polysaccharide pneumococcal vaccines may be ineffective in this age group. New conjugate pneumococcal vaccines are now available, which may help to reduce the incidence of infection in people with sickle cell disease.

Objectives: To determine the efficacy of pneumococcal vaccines for reducing morbidity and mortality in people with sickle cell disease.

Search strategy: We searched the Cochrane Cystic Fibrosis and Genetic Disorders Group trials register, comprising of references identified from comprehensive electronic database searches and hand searching relevant journals and abstract books of conference proceedings. In addition, we contacted relevant pharmaceutical companies and experts in the field.Date of most recent search of Group's trials register: November 2003.

Selection criteria: All randomised and quasi-randomised controlled trials comparing a polysaccharide or conjugate pneumococcal vaccine regimen with a different regimen or no vaccination in people with sickle cell disease.

Data collection and analysis: Two reviewers independently selected studies for inclusion, extracted data and assessed trial quality.

Main results: Nine trials were identified in the searches and five trials, with a total of 547 participants, met the inclusion criteria. Only one trial reported incidence of pneumococcal infection, and this demonstrated that the polysaccharide pneumococcal vaccine used (PPV14) failed to significantly reduce the risk of infection in children under three years of age, but was associated with only minor adverse events. Three trials of conjugate pneumococcal vaccines found that immune response was increased compared to control groups, including in infants, although clinical outcomes were not measured in these trials.

Reviewer's conclusions: Previous trials have shown that conjugate pneumococcal vaccines are safe and effective in normal healthy patients, even those under the age of two years. The controlled trials included in this review have demonstrated immunogenicity (the body's response, without which there is no protection) of these vaccines, and observational studies in people with sickle cell disease support these findings. We therefore recommend that conjugate pneumococcal vaccines are used in people with sickle cell disease. Randomised trials in patients with sickle cell disease will be needed to determine the optimal vaccination regimen when further, potentially more effective vaccines become available. Such trials should measure clinical outcomes of effectiveness.

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Conflict of interest statement

Since the publication of the original review Graham Davies has been awarded funding by Wyeth Pharmaceuticals to conduct an investigator‐sponsored study of conjugate pneumococcal vaccine in another condition as well as sponsorship to attend an international conference.

Since publication of the original review, Ceri Hirst has received funding from several pharmaceutical companies for contract research unrelated to the review topic.

Figures

1.1
1.1. Analysis
Comparison 1 PPV14 versus Hib, Outcome 1 Incidence of proven pneumococcal infection.
2.1
2.1. Analysis
Comparison 2 PPV14 versus placebo, Outcome 1 Adverse events related to the vaccine.
3.1
3.1. Analysis
Comparison 3 PPV23 versus PCV7+PPV23, Outcome 1 Antibody responses.
3.2
3.2. Analysis
Comparison 3 PPV23 versus PCV7+PPV23, Outcome 2 Adverse events related to the vaccine.
4.1
4.1. Analysis
Comparison 4 PCV9+PPV23 versus Hib+PPV23, Outcome 1 Fatalities.
4.2
4.2. Analysis
Comparison 4 PCV9+PPV23 versus Hib+PPV23, Outcome 2 Antibody responses.
5.1
5.1. Analysis
Comparison 5 PCV9+Hib versus PCV9, Outcome 1 Fatalities.
5.2
5.2. Analysis
Comparison 5 PCV9+Hib versus PCV9, Outcome 2 Antibody responses.
6.1
6.1. Analysis
Comparison 6 PCV9+Hib versus PCV9+PPV23, Outcome 1 Fatalities.
6.2
6.2. Analysis
Comparison 6 PCV9+Hib versus PCV9+PPV23, Outcome 2 Antibody responses.
7.1
7.1. Analysis
Comparison 7 PCV9+PPV23 versus PCV9, Outcome 1 Fatalities.
7.2
7.2. Analysis
Comparison 7 PCV9+PPV23 versus PCV9, Outcome 2 Antibody responses.

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  • doi: 10.1002/14651858.CD003885

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