Most sore throats are caused by viruses the same germs that cause colds and flu or influenza. Less frequently, sore throats are due to bacterial infections. Viruses and bacteria both enter your body by your mouth or nose either because you breathe in particles that are released into the air when someone coughs or sneezes, or because you have contact with an infected individual or use shared objects such as utensils, towels, toys, doorknobs or a telephone.
Because the germs that cause sore throats are infectious, they can spread easily wherever large numbers of people congregate, such as schools, child care centers and offices.
The most common viral illnesses that cause a sore throat include
• Common cold
• Flu (influenza)
• Mononucleosis (mono)
Other viral illnesses that can cause a sore throat include
• Measles
• Chickenpox
• Croup — a common childhood illness characterized by a harsh, barking cough
source: mdinfo
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