Discussion

Summary of model and results
Discussion topics go here!
Infection and social attraction
Our results suggest that social influences affect both disease prevalence and group movement dynamics. However, infection can also change the degree of gregariousness demonstrated by an individual. For instance, an immune response triggered during infection can lead to sickness behaviours (Hart 1988): adaptive behavioural changes in infected individuals that help combat infection. This includes anorexia, lethargy, and reduced social interactions. It may be that the social attraction of sick individuals may be quite a bit lower than in healthy, gregarious individuals. This reduced gregariousness has the benefit of reducing disease spread within populations (See Shakhar and Shakhar 2015). Known as the "Eyam hypothesis": sickness behavior protects the social group of infected individuals by limiting their direct contacts, preventing them from contaminating the environment, and broadcasting their health status. Kin selection promotes such behaviors.
Alternatively,  
References: 
Hart, B.L. 1988 Biological basis of the behavior of sick animals. Neurosci. Biobehav. Rev. 12, 123-137. (doi:https://doi.org/10.1016/S0149-7634(88)80004-6).
Shakhar, K. & Shakhar, G. 2015 Why Do We Feel Sick When Infected—Can Altruism Play a Role? PLoS Biol 13, e1002276. (doi:10.1371/journal.pbio.1002276)
... discussion of systems where this is ecologically relevant.  For example, stickleback, as shown in Figure \ref{537386}.  (or some other example).