| Rabies virus | Arbovirus, Rabies, Rickettsia and Related Zoonotic Diseases | Serology | Rabies Serum Neutralization Assay | 
| Relapsing fever Borrelia | Field Studies | Molecular Detection | Molecular Detection | 
| Respiratory syncytial virus (RSV) | Influenza, Respiratory Viruses and Coronaviruses | Molecular Detection | Molecular Detection by PCR or RT-PCR | 
| Rhodococcus spp. |  |  |  | 
| Ricinus communis | Bioforensics Assay Development and Diagnostics | Molecular Detection | Molecular detection of Ricinus communis by real-time PCR | 
| Ricinus communis | Bioforensics Assay Development and Diagnostics | Serology | Ricin Antigen Capture ELISA | 
| Rift Valley Fever (RVF) virus | Special Pathogens | Molecular Detection | Molecular Detection of Rift Valley Fever (RVF) virus | 
| Rift Valley Fever (RVF) virus | Special Pathogens | Serology | Detection of antibodies against Rift Valley Fever (RVF) virus by ELISA | 
| Rift Valley Fever (RVF) virus | Special Pathogens | Isolation | Isolation of Rift Valley Fever virus | 
| Ross River virus | Arbovirus, Rabies, Rickettsia and Related Zoonotic Diseases | Serology | Detection of IgG Antibodies Directed Towards Ross River Virus by ELISA | 
| Ross River virus | Arbovirus, Rabies, Rickettsia and Related Zoonotic Diseases | Serology | Detection of IgM Antibodies Directed Towards Ross River Virus by ELISA | 
| Rothia mucilaginosa |  |  |  | 
| Rubella virus | Measles, Mumps and Rubella Unit | Serology | Enzyme Linked Immunosorbant Assay (ELISA) - IgM | 
| Rubella virus | Measles, Mumps and Rubella Unit | Serology | IgG Avidity by Enzyme Linked Immunosorbant Assay (ELISA) | 
| Rubella virus | Measles, Mumps and Rubella Unit | Serology | Enzyme Linked Immunosorbant Assay (ELISA) - IgG |