[Estimate of undiagnosed HIV cases in the Cajamarca region of Peru: probabilistic linkage between databases].

Undiagnosed HIV cases contribute to the increase in new infections, therefore estimating this figure is important in order to assess strategies in HIV control programs. The objective of this study was to estimate the number of undiagnosed HIV cases in the Cajamarca region in Peru between 2015 and 2021. HIV cases were obtained from three sources of information: The Regional Health Strategy for HIV Prevention and Control (ESPC-HIV); the HIV epidemiological notification application (Noti-HIV), and the laboratory information system (Netlab).