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Upper Respiratory Infections
1) Upper respiratory tract infections are very common and cause significant illness and costs. The nose, mouth and throat are exposed to viruses and normally harbor bacteria that can cause infection when barriers are compromised. 2) The common cold is usually self-limiting and caused by rhinoviruses, though other viruses can also cause cold symptoms. It is a major cause of illness. 3) Acute bacterial sinusitis occurs when viral infection blocks sinus drainage, allowing bacteria like streptococcus pneumoniae to infect the sinuses. Symptoms include nasal congestion and facial pain.
