Fig. 1

Frequency of post-contact screenings shown by number of included contacts. The bar graph illustrates the frequency of initiated post-contact screenings. The bars indicate the frequency categorized by the size of each screening. The y-axis represents the size of the screenings in increments of 10 contacts, while the x-axis shows the frequency in which screenings of each size were initiated. *post-contact screenings of up to 10 contacts have been initiated 343 times. For clarity, the x-axis is visually limited to 100