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• Sometimes occurrence of infectious disease in animals can be traced back to the introduction on one sick animal several days previously. In this situation the initial sick animal may infect 1-2 other animals who in turn infect several more animals. The number of disease cases may be very small to begin with and then rapidly grow as more infected animals spread the disease.
• Sometimes multiple animals can be exposed at once to an infectious agent and disease occurs all at once in many animals. An example is anthrax where several animals may die suddenly and then no more cases may occur for a period.