| AOM | acute otitis media |
| APC | antigen-presenting cell |
| ASC | antibody-secreting cell |
| CPS | C-polysaccharide |
| CT | cholera toxin |
| D | diphtheria toxoid |
| ELISPOT | enzyme-linked immunospot assay |
| GM | geometric mean |
| GMC | geometric mean concentration |
| Hib | Haemophilus influenzae type b |
| ISC | immunoglobulin-secreting cell |
| MEF | middle ear fluid |
| MHC | major histocompatibility complex |
| NPA | nasopharyngeal aspirate |
| OMPC | outer membrane protein complex |
| PBMC | peripheral blood mononuclear cell |
| Pnc | Streptococcus pneumoniae, pneumococcus |
| PRP | capsular PS of Hib; polyribosylribitol phosphate |
| PS | polysaccharide |
| PsaA | pneumococcal surface adhesin |
| PspA | pneumococcal surface protein A |
| RSV | respiratory syncytical virus |
| SC | secretory component |
| S-IgA | secretory immunoglobulin A |
| TD | thymus-dependent |
| TI | thymus-independent |
| T | tetanus toxoid |