###HUMAN: count the number of patients whose diagnoses short title is acute uri nos and lab test fluid is ascites?, ###ASSISTANT: SELECT COUNT(DISTINCT demographic.subject_id) FROM demographic INNER JOIN diagnoses ON demographic.hadm_id = diagnoses.hadm_id INNER JOIN lab ON demographic.hadm_id = lab.hadm_id WHERE diagnoses.short_title = "Acute uri NOS" AND lab.fluid = "Ascites"