| rt_PCR | real-time PCR |
| OR | odds ratio |
| IQR | interquartile range |
| IPD | invasive pneumococcal disease |
| PCV7 | pneumococcal 7-valent conjugate vaccine |
| PCV13 | pneumococcal 13-valent conjugate vaccine |
| PPV23 | pneumococcal 23-valent polysaccharides vaccine |
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