In which condition is acute non-suppurative sialadenitis commonly observed?

Explanation

Acute non-suppurative sialadenitis is typically associated with mumps, a viral infection that causes inflammation of the salivary glands without pus formation. In contrast, acute bacterial sialadenitis involves pus, chronic bacterial sialadenitis is a long-standing infection, and necrotizing sialometaplasia is a different necrotizing condition of salivary tissue.