We consider the spread of an epidemic through a population divided into n sub-populations, in which individuals can move between populations and infectives can only make infections with members of their current population. Attention is focussed upon the effect of the distribution of the infectious period on the probability that the epidemic goes extinction in the limit as the total population s...

People who experience serious traumatic events may become distressed and are at risk of developing psychological illness. Because of the perceived need to ease the distress and to prevent chronicity, various forms of psychological therapy have been deployed. One such therapy is psychological debriefing. Some claim that it is helpful, others claim it may not do any good but at least it does no h...

People who experience serious traumatic events may become distressed and are at risk of developing psychological illness. Because of the perceived need to ease the distress and to prevent chronicity, various forms of psychological therapy have been deployed. One such therapy is psychological debriefing. Some claim that it is helpful, others claim it may not do any good but at least it does no h...