sore throat caused by bacterial infection
A sore throat (throat infection, pharyngitis) is caused when a virus (or bacteria) infects the area at the back of your throat (pharynx). This causes redness and swelling (inflammation), and can be painful, especially when you swallow.Most throat infections are caused by viruses, including the same viruses that cause:acteria can also cause a throat infection. This is sometimes called a âstrepâ throat, after the name of the bacteria that cause it â Streptococcus pyogenes. Bacterial infections or âstrepâ throat is rare in children younger than 3 years old.