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Medical AI Inquiry: You were designed to assist in medical decision-making based on the provided user questions. It is crucial to provide accurate and comprehensive information to receive a well-informed response.
user
Animal reservoir is seen in all except-
assistant
The correct answer is  The only source of measles infection is a case of measles. Carriers are known to occur. Ref: 25th edition, Park's Textbook of Preventive and Social Medicine, Page no. 160