Table 1.

HIV testing typology for the baseline model (clinic test only) of HIV transmission dynamics among men who have sex with men in Seattle and Atlanta.

Tester type	Baseline testing behavior	Opportunistic testing behavior
Never testers	None	None
Opportunistic-only testers	None	Likelihood of testing when presented with an opportunity to test (varies by the tester type)
Regular testers	Test interval varies by HIV risk category (defined by high vs low AIa frequency)
Risk-based testers	Testing likelihood and time to test varies by three types of events: (1) CAIb in non‐main partnership, (2) CAI within known serodiscordant partnership, and (3) Acquisition of new main partner

^aAI: anal intercourse.

^bCAI: condomless anal intercourse.