Increasing the distance between key employees is the main goal of:
To illustrate the spread of the contagion in a company we need to draw social network map of the connections between employees in a given organization. A grey line indicates face-to-face [F2F] contact between two employees.

Suppose one of the employees visits relatives in Mexico and comes home sick. According to analisys done by Valdis Krebs, the disease will spread like this, because infectious individuals constantly come in contact with those who have not been exposed:

Because of local density in a typical human network, a healthy person can be exposed to multiple sick individuals, thus increasing the odds of transmission.
Ironically, the network structure that enhances the transmission of good contagions — such as ideas, solutions, and knowledge, can also transmit bad contagions such as disease and fear. When the network is transporting ideas and knowledge we want to decrease distance between individuals.
When the network starts to transmit disease we want to increase distance and fragmentation in the network to isolate the virus and slow/stop the spread.
Source: TNT blog