  We present an evaluation of the effectiveness of manual contact tracing
compared to bulletin board contact tracing. We show that bulletin board contact
tracing gives comparable results in terms of the reproductive number, duration,
prevalence and incidence but is less resource intensive, easier to implement
and offers a wider range of privacy options. Classical contact tracing focuses
on contacting individuals whom an infectious person has been in proximity to. A
bulletin board approach focuses on identifying locations visited by an
infectious person, and then contacting those who were at those locations. We
present results comparing their effects on the overall reproductive number as
well as the incidence and prevalence of disease. We evaluate them by building a
new discrete time stochastic model based on the Susceptible Exposed Infectious
and Recovered (SEIR) framework for disease spread. We conduct simulation
experiments to quantify the effectiveness of these two models of contact
tracing by calibrating the model to be compatible with SARS-CoV-2. Our
experiments show that location-based bulletin board contact tracing can improve
manual contact tracing.
