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Like colds, the vast majority of sore throats are caused by viral infections. This means most sore throats will NOT respond to antibiotics. Many people have a mild sore throat at the beginning of every cold. When the nose or sinuses become infected, drainage can run down the back of the throat and irritate it, especially at night. Or, the throat itself can be infected.

Some viruses can cause specific types of sore throat. For example, Coxsackievirus sometimes causes blisters in the throat, especially in the late summer and early fall. Mono and the flu can also cause specific viral throat infections.

Strep throat is the most common bacterial cause of sore throat. Because strep throat can occasionally lead to rheumatic fever, antibiotics are given. Strep throat often includes a fever (greater than 101°F), white draining patches on the throat, and swollen or tender lymph glands in the neck. Children may have a headache and stomach pain.

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http://0-www.nlm.nih.gov.catalog.llu...cle/003053.htm

Don't know what I'd do, guess get more swabs taken and see if something different could be tried instead of the antibiotics.