A 27 year old man develops 102 degree fever. Physical exam shows bilateral parotid gland swelling and orchitis. 1. What is likely diagnosis? 2. Antibodies agains the most likely causal agent are ineffective due to what reason?

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1. A 27 year old man develops 102 degree fever. Physical exam shows bilateral parotid gland swelling and orchitis. 1. What is likely diagnosis? 2. Antibodies agains the most likely causal agent are ineffective due to what reason?