| RRI | recurrent respiratory infection; reflex relaxation index; relative response index |
|---|---|
| RRIS | recurrent respiratory infection syndrome |
| RTI | respiratory tract infection; reverse transcriptase inhibition |
| RURTI | recurrent upper respiratory tract infection |
| SENIC | study of the efficacy of nosocomial infection control |
| PHI | primary HIV infection |
|---|---|
| SBI | serious bacterial infection |
| URI | upper respiratory tract infection |
| WPI | week post infection |