instruction: get the number of patients who are diagnosed with ac infect polyneuritis and lab test abnormal status is delta.
response: 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 = "Ac infect polyneuritis" AND lab.flag = "delta"