<unk>  usually arises as a complication of an untreated or partially treated episode of acute tonsillitis. The infection, in these cases, spreads to the<unk>  area (peritonsillitis). This region comprises loose connective tissue and is hence susceptible to formation of an abscess.<unk>  can also occur de novo. Both aerobic and anaerobic bacteria can be causative. Commonly involved aerobic pathogens include Streptococcus, Staphylococcus and Haemophilus. The most common anaerobic species include Fusobacterium necrophorum, Peptostreptococcus, Prevotella species, and Bacteroides.
Peritonsillar abscess
Epiglottitis
Retropharyngeal abscess
Infectious mononucleosis
Parapharyngeal abscess
Adenoiditis
Streptococcal pharyngitis
Tonsillitis