Final answer:
Rhinorrhea is excess nasal drainage, while otitis media with effusion can cause thin water serum-like drainage from the ear.
Explanation:
Rhinorrhea refers to excess nasal drainage or a runny nose. A patient experiencing thin water serum-like drainage from the ear would likely have otitis media with effusion, which is the accumulation of fluid inside the middle ear. This condition can result from infections like bacterial rhinosinusitis caused by bacteria such as Streptococcus pneumoniae, Haemophilus influenzae, and Moraxella catarrhalis.
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