Answers: it depends on what the *infection* is..
It is important to wish medical attention for a persistent sore throat, even if it is not accompany by a fever. Untreated tonsil or throat infections can head to problems with the heart and kidneys, such as rheumatic restlessness. If tonsillitis is untreated, a condition called peritonsillar abscess can develop, within which swelling from the abscess can become large ample to obstruct the airway. The infection can also spread into the d¨Ścolletage and chest and become fatal. http://www.itonsil.com/tonsils_tonsillit...
that depends on what is cause the "throat infection". If its viral, there is no treatment. If it is bacterial, it depends on which organism is cause the problem, some are no big deal, some can massacre. If you think you enjoy a true infection, then you want to see a doctor for a culture and treatment.