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Patte formation of a spatial epidemic model with nonlinear incidence rate kI2 S/ (1 + αI2) is investigated. Our results show that strange spatial dynamics, i.e., filament-like patte, can be obtained by both mathematical analysis and numerical simulation, which are different from the previous results in the spatial epidemic model such as stripe-like or spotted or coexistence of both patte and so on. The obtained results well extend the finding of patte formation in the epidemic model and may well explain the distribution of the infected of some epidemic.