| PRNT | plaque reduction neutralization test |
|---|---|
| SP | sacroposterior; sacrum to pubis; salivary progesterone; schizotypal personality; semi-private [room]... |
| VPI | Visible Plaque Index |
|---|---|
| HPFC | haemolytic plaque forming cell |
| RHPA | reverse haemolytic plaque assay |
| SP | small plaque |