Prognosis
Since the advent of penicillin in the 1940s, a major preoccupation in the treatment of streptococcal tonsillitis has been the prevention of rheumatic fever, and its major effects on the nervous system and heart. Complications may rarely include dehydration and kidney failure due to difficulty swallowing, blocked airways due to inflammation, and pharyngitis due to the spread of infection.An abscess may develop lateral to the tonsil during an infection, typically several days after the onset of tonsillitis. This is termed a peritonsillar abscess (or quinsy). Rarely, the infection may spread beyond the tonsil resulting in inflammation and infection of the internal jugular vein giving rise to a spreading infectious thrombophlebitis (Lemierres syndrome).In strep throat, diseases like post-streptococcal glomerulonephritis can occur. These complications are extremely rare in developed nations but remain a significant problem in poorer nations. Epidemiology
Tonsillitis occurs throughout the world, without racial or ethnic differences. Most children have tonsillitis at least once 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. Society and culture
Tonsillitis is described in the ancient Greek Hippocratic Corpus.Recurrent tonsillitis can interfere with vocal function and the ability to perform among people who use their voices professionally. References
Books cited

Dean-Jones L (2013). "The Child Patient of the Hippocratics: Early Pediatrics?". In Grubbs JE, Parkin T (eds.). The Oxford Handbook of Childhood and Education in the Classical World. Oxford University Press. doi:10.1093/oxfordhb/9780199781546.013.005. ISBN 9780199781546. Ferri FF (2015).
Therefore, throat culture is not routinely used in clinical practice for the detection of GABHS.Bacterial culture may need to be performed in cases of a negative rapid streptococcal test. An increase in antistreptolysin O (ASO) streptococcal antibody titer  following the acute infection can provide retrospective evidence of GABHS infection and is considered definitive proof of GABHS infection, but not necessarily of the tonsils. Epstein Barr virus serology can be tested for those who may have infectious mononucleosis with a typical lymphocyte count in full blood count result. Blood investigations are only required for those with hospital admission requiring intravenous antibiotics. Increased values of secreted phospholipase A2 and altered fatty acid metabolism  observed in people with tonsillitis may have diagnostic utility.Nasoendoscopy can be used for those with severe neck pain and inability to swallow any fluids to rule out masked epiglotitis and supraglotitis. Routine nasoendscopy is not recommended for children. Treatment
Treatments to reduce the discomfort from tonsillitis include:
pain and fever reducing medications such as paracetamol (acetaminophen) and ibuprofen
warm salt water gargle, lozenges, honey, or warm liquidsThere are no antiviral medical treatments for virally caused tonsillitis. Antibiotics
If the tonsillitis is caused by group A streptococcus, then antibiotics are useful, with penicillin or amoxicillin being primary choices. Cephalosporins and macrolides are considered good alternatives to penicillin in the acute care setting. A macrolide, such as azithromycin or erythromycin, is used for people allergic to penicillin. If penicillin therapy fails, bacterial tonsillitis may respond to treatment effective against beta-lactamase producing bacteria such as clindamycin or amoxicillin-clavulanate.