| Normal CD4+ T-cell count | 500–1500 cells/μL | Below 200/μL = AIDS diagnosis |
| AIDS diagnosis threshold | CD4+ < 200 cells/μL | Or AIDS-defining illness regardless of count |
| P. vivax fever cycle | 48 hours (benign tertian) | Synchronous RBC lysis interval |
| P. falciparum fever cycle | 48 hours (malignant tertian) | Also 48h but more severe |
| P. malariae fever cycle | 72 hours (quartan) | Less common species |
| Antibody secretion rate (plasma cell) | 1000–2000 antibodies/second | Per activated plasma cell |
| Immunoglobulin classes | 5 (IgA, IgD, IgE, IgG, IgM) | ADGME mnemonic |
| IgG serum concentration | 700–1600 mg/dL | Most abundant serum Ig |
| IgE serum concentration | < 0.05 mg/dL | Least abundant; mediates allergy |
| Plasmodium sporozoite incubation | 10–14 days (liver phase) | Pre-erythrocytic phase duration |
| HIV window period (ELISA) | 3–12 weeks | Time before antibodies detectable |
| Maternal IgG passive protection | 3–6 months post-birth | Then declining as maternal IgG catabolized |