Match the columns:
| Rickettsial disease | Causative agent |
| P. Rocky mountain spotted fever | 1. Rickettsia typhi |
| Q. Epidemic typhus | 2. Rickettsia akari |
| R. Endemic typhus | 3. Rickettsia rickettsiae |
| S. Rickettsial pox | 4. Rickettsia prowazekii |
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