| Biological description | Interaction | Reaction rate | Translation to ODE |
| CD4+ T cells production. |
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| CD4+ T cells natural death. |
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| CD4+ T cells become infected by virus.
Rate at which virus attack CD4+ T cells. |
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| CD4+ T cells invaded by pathogen.
Rate at which pathogen invade CD4+ T cells. |
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| Death of virus infected CD4+ T cells. |
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| Virus replication in infected CD4+ T cells. |
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| Virus natural death. |
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| Death of pathogen infected CD4+ T cells. |
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| Pathogen replication in infected CD4+ T cells. |
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| Elimination of pathogens. |
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