Figure 1.

The network and properties of social contacts reported in the survey. (a) A network representation of all encounters reported in the survey. Red circles represent the participants, blue circles are non-participating individuals who are encountered by more than one participant and grey circles are non-participating individuals encountered only by one participant. Red lines represent encounters made between participants, blue lines are encounters with non-participating individuals who are encountered by more than one participant and grey lines are encounters with non-participating individuals encountered only by one participant. (b) The distribution of daily encounters (degree) recorded by participants for (i) all contact types (mean, 14.29; grey bars), (ii) contacts that were conversational only (mean, 12.3; green bars) and (iii) contacts that included skin-to-skin physical contact (mean, 1.99; orange bars). Each day reported by each participant is treated independently. (c) Daily degree by social context for casual contacts (all contacts, black) and close contacts (only physical contacts, red). ‘Work’ excludes reported weekend work contacts; ‘other’ combines travel and shopping encounters. Boxes bound the 25 and 75% quartiles; horizontal lines and pluses represent the median and mean, respectively. Note that casual and close contacts are plotted on different scales in different colours (black and red, respectively).