Assertion: subunit vaccine | /r/HasProperty | pcv–ppsv23 sequence
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Source sentences:
text: Studies evaluating the immune response to a conjugate vaccine (PCV7 or PCV13) followed by the polysaccharide vaccine (PCV–PPSV23 sequence) at intervals of 2, 6, or 12 months or 3–4 years demonstrated that following the PPSV23 dose, antibody levels against serotypes common to both vaccines were higher than the pre-PCV baseline (5,6,8–13).