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Overview

What Is Streptococcal Pharyngitis?

Streptococcal pharyngitis is a throat infection caused by group A Streptococcus bacteria. It is especially common in children and adolescents, although people of any age can develop it. This type of acute pharyngitis can cause a sore throat, fever, and painful swallowing. Not every sore throat is bacterial; many are caused by viruses and do not need antibiotics.

Symptoms

Symptoms of Streptococcal Pharyngitis

  • Fever
  • Painful swallowing (odynophagia)
  • Swollen neck lymph nodes
  • Red tonsils
  • Tonsillar exudate
  • Headache
  • Nausea
  • Abdominal pain

How It Spreads

How Streptococcal Pharyngitis Spreads

Group A Streptococcus spreads through respiratory droplets and close contact with an infected person. Exposure to saliva or nasal secretions, such as through coughing, sneezing, or sharing personal items, can transmit the bacteria. Schools, households, childcare settings, and other crowded places make spread easier because people are in close contact for extended periods. A person is generally most contagious while ill and may remain contagious until they have been fever-free and have completed the period of antibiotic treatment recommended by a clinician.

  • Wash your hands often with soap and water, especially after coughing, sneezing, or caring for someone who is ill.
  • Cover coughs and sneezes with a tissue or your elbow rather than your hands.
  • Avoid sharing cups, utensils, food, or other items that may contact saliva.
  • Stay home while feverish and follow clinical guidance about returning to school or work after starting antibiotics.
  • Complete the prescribed antibiotic treatment even if symptoms improve sooner.

Risk Factors

Risk Factors for Streptococcal Pharyngitis

  • Being a school-age child increases the likelihood of exposure to group A Streptococcus.
  • Having close contact with someone who has a confirmed or suspected infection increases exposure risk.
  • Spending time in crowded group settings, such as schools or childcare facilities, can make transmission easier.
  • Exposure during winter and early spring is associated with more cases.
  • Living in a household or community experiencing an outbreak increases the chance of infection.

Complications

Complications of Streptococcal Pharyngitis

  • A peritonsillar abscess is an uncommon collection of pus beside a tonsil that can cause severe throat pain and swelling.
  • A retropharyngeal abscess is an uncommon deep infection behind the throat that can affect swallowing or breathing.
  • Cervical lymphadenitis is an infection and swelling of lymph nodes in the neck.
  • Scarlet fever can cause a characteristic rash along with the throat infection.
  • Acute rheumatic fever is an uncommon immune-related complication that can affect the heart, joints, skin, or nervous system.
  • Post-streptococcal glomerulonephritis is an uncommon kidney inflammation that can occur after infection.

Seek urgent care

Warning signs of complications

Seek urgent medical care for difficulty breathing, inability to swallow liquids, drooling, severe one-sided throat pain or swelling, or a muffled voice. These symptoms may indicate a local complication that needs prompt assessment.

Diagnosis

Diagnosis of Streptococcal Pharyngitis

Clinicians review symptoms and examine the throat, but they cannot reliably diagnose streptococcal pharyngitis from symptoms alone. When cough, runny nose, hoarseness, or conjunctivitis strongly suggests a viral infection, bacterial testing may not be needed. When group A Streptococcus is possible, a throat swab can help confirm the cause of the acute pharyngitis.

TestWhat it showsTypical timingImportant follow-up
Rapid antigen detection testDetects group A Streptococcus from a throat swab.Results are usually available during the visit.In children and adolescents, a negative result may need confirmation with a throat culture, depending on clinical guidance.
Throat cultureChecks a throat specimen for growth of group A Streptococcus.Results usually take longer than a rapid test because the specimen needs time to grow.It can confirm infection when a rapid test is negative but clinical concern remains, especially in children and adolescents.

Treatment & Management

Streptococcal Pharyngitis Treatment and Management

Confirmed streptococcal pharyngitis is treated with a clinician-prescribed antibiotic, with penicillin or amoxicillin commonly used as first-line options when appropriate. Antibiotics can shorten illness, reduce transmission, and lower the risk of complications, but they are not useful for viral sore throats. The clinician chooses the drug and duration based on age, allergies, local guidance, test results, and medical history. This streptococcal sore throat treatment should not be shared with anyone else or saved for a future illness.

  • Drink plenty of fluids to help prevent dehydration.
  • Choose soft foods if swallowing is painful.
  • Get adequate rest while recovering.
  • Try warm liquids or age-appropriate salt-water gargles if they are safe for the person.
  • Use clinician-approved medicine for pain or fever, and do not give aspirin to children.

Prevention

Preventing Streptococcal Pharyngitis

  • Wash your hands regularly with soap and water or use an alcohol-based hand sanitizer when soap is unavailable.
  • Cover coughs and sneezes with a tissue or your elbow and dispose of used tissues promptly.
  • Do not share cups, utensils, toothbrushes, or other personal items during illness.
  • Clean frequently touched surfaces when someone in the household is ill.
  • Stay home until a clinician’s guidance indicates that you are no longer considered contagious.

Outlook and Prognosis

Outlook and Prognosis

Most people recover fully from streptococcal pharyngitis, and symptoms commonly improve over several days after appropriate treatment. Untreated infection may remain contagious longer and carries a higher risk of complications. Recovery can vary, so follow the treatment plan and monitor symptoms rather than assuming that every sore throat will resolve in the same way.

When Should You See a Doctor

When Should You See a Doctor?

  • Arrange medical evaluation for a severe sore throat with fever.
  • Contact a clinician after exposure to someone with confirmed streptococcal pharyngitis, especially if symptoms develop.
  • Seek evaluation for difficulty swallowing.
  • Arrange assessment when a child develops significant throat symptoms or fever.
  • Contact a clinician if symptoms are worsening rather than improving.
  • Seek medical advice if symptoms do not improve as expected.

Get urgent help

Emergency throat symptoms

Get urgent medical help for trouble breathing, inability to swallow saliva or fluids, drooling, rapidly increasing neck or throat swelling, confusion, or signs of dehydration such as very little urination, marked weakness, or inability to keep fluids down.

Symptoms

2 topics

  • Streptococcal Pharyngitis

    Fever

  • Streptococcal Pharyngitis

    Sore Throat