<unk>  occurs throughout the world, without racial or ethnic differences. Most children have<unk>  at least during their childhood, although it rarely occurs before the age of two. It most typically occurs between the ages of four and five; bacterial infections most typically occur at a later age.
Tonsillitis
Laryngitis
Croup
Sinusitis
Epiglottitis
Adenoiditis
Esophagitis
Pharyngitis