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Vaccine. 2015 Jul 31;33(32):3779-83. doi: 10.1016/j.vaccine.2015.06.100. Epub 2015 Jul 2.

Long-lasting hyporesponsivenss induced by the 23-valent pneumococcal polysaccharide vaccine (PPV23) in asplenic patients with β-thalassemia major.

Author information

1
'Aghia Sophia' Children's Hospital, Department of Infectious Diseases, Athens University Medical School, Thivon & Levadias Str., 115 27 Athens, Greece. Electronic address: joannapapadatou@gmail.com.
2
'Aghia Sophia' Children's Hospital, Department of Infectious Diseases, Athens University Medical School, Thivon & Levadias Str., 115 27 Athens, Greece.
3
'Aghia Sophia' Children's Hospital, Department of Infectious Diseases, Athens University Medical School, Thivon & Levadias Str., 115 27 Athens, Greece. Electronic address: mpapagrig@med.uoa.gr.
4
'Aghia Sophia' Children's Hospital, Department of Infectious Diseases, Athens University Medical School, Thivon & Levadias Str., 115 27 Athens, Greece. Electronic address: vspoulou@med.uoa.gr.

Abstract

We have previously shown that multiple vaccinations with 23-valent pneumococcal polysaccharide vaccine (PPV23s) resulted in attenuated antibody responses to subsequent 7-valent conjugate vaccine (PCV7) in asplenic adults with β-thalassemia major (Orthopoulos et al. Vaccine 2009; 27:350). However, there is evidence that PPV23-induced immune hyporesponsiveness could be overcome with time (Papadatou et al. Clin Infect Dis 2014; 59:862). In the current study we investigate the duration of hyporesponsiveness in the same cohort seven years after the original study vaccinations. Patients received one dose of 13-valent conjugate vaccine (PCV13) and antibody levels were measured before and one month after vaccination. Antibodies increased significantly after vaccination with PCV13, but were lower than post-PCV7 seven years earlier. Lower pre-vaccination antibody levels were associated with more robust response to PCV13. Our findings suggest that PPV23 should be used cautiously in asplenic adults vaccinated with multiple PPV23s in the past. Measurement of anti-pneumococcal antibodies before and after vaccination could be used to optimise timing of vaccinations and certify vaccine immunogenicity in such individuals.

KEYWORDS:

Asplenia; Hyporesponsiveness; Pneumococcal vaccine

PMID:
26144903
DOI:
10.1016/j.vaccine.2015.06.100
[Indexed for MEDLINE]

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