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Figure 1 | BMC Veterinary Research

Figure 1

From: EpiContactTrace: an R-package for contact tracing during livestock disease outbreaks and for risk-based surveillance

Figure 1

Schematic illustration of the time window of possible introduction of a contagious disease to a farm, related to relevant time periods for contacts tracing. The short arrows represent contacts; the light grey (C and E) represent ingoing contacts that could have introduced the disease; the dark grey (D, F and H) represent contacts which could have spread the disease. Contact A and G are ingoing contacts before and after the window of possible introduction and therefore not potential sources. Contact B is before the potential introduction and can therefore not have spread the disease. In relation to EpiContactTrace, the dotted lines represent how time periods can be indicated: a) the time period for ingoing contacts specified through dates for inBegin and inEnd, b) the time period for outgoing contacts specified through dates for outBegin and outEnd, c) the period can also be specified through a date tEnd and specifying the number of days of interest preceding that date, this will result in the same period for ingoing and outgoing contacts.

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