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\subsection{Herd Immunity}  Herd immunity may be defined as a method of indirect protection from a disease when a large percentage of the population is immunised from a disease, thereby protecting the minority of that population that cannot be immunised for a number of reasons, most commonly medical exclusion or religious pressures. Individuals who are immunised are said to be a barrier to a spread of a disease, as they either reduce the rate at which the disease spreads, or prevent the spread entirely. When a critical proportion of the population becomes immunised against the disease, the disease will cease to spread and exist. This is call the Herd Immunity Threshold (HIT).