Trofile assay

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The Trofile assay is a blood test that identifies the tropism of a patient's HIV.

A molecular assay, Trofile was developed by Monogram Biosciences for use in HIV treatment. The assay's purpose is to identify the tropism of an individual patient's HIV strain – R5, X4, or a combination of these known as dual/mixed (D/M). The results show whether the patient is infected with virus that enters cells using the R5 co-receptor, the X4 co-receptor, or both (dual/mixed).

Patients with strains of HIV that prefer the R5 receptor tend to remain healthy longer than those with the strains that prefer X4. However, over the course of the disease, a patient's viral population may undergo a "tropism switch" from R5 to X4.[citation needed]


  • Whitcomb, JM; Huang, W; Fransen, S; et al. (2007). "Development and characterization of a novel single-cycle recombinant virus assay to determine human immunodeficiency virus type 1 coreceptor tropism". Antimicrob Agents Chemother. 51 (2): 566–575.

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