  We consider a multitype epidemic model which is a natural extension of the
randomized Reed--Frost epidemic model. The main result is the derivation of an
asymptotic Gaussian limit theorem for the final size of the epidemic. The
method of proof is simpler, and more direct, than is used for similar results
elsewhere in the epidemics literature. In particular, the results are
specialized to epidemics upon extensions of the Bernoulli random graph.
