Sore throat and fever are very common symptoms in children, particularly during the autumn and winter months. In most cases, they are caused by viral infections and do not require antibiotics.
However, there are cases in which the cause is Group A Streptococcus (Streptococcus pyogenes), a bacterium that can cause streptococcal pharyngitis or tonsillitis.
The important thing is to know when a streptococcal infection should be suspected, when a strep test is needed, and when antibiotic treatment is necessary.
What is streptococcal pharyngitis?
Streptococcal pharyngitis is caused by Group A Streptococcus. It is more common in school-aged children, particularly between 5 and 15 years of age, and is uncommon as a cause of typical pharyngitis in children younger than 3 years.
Streptococcus is transmitted mainly through close contact and respiratory secretions. Transmission is more common in settings where children are in close contact with one another, such as schools and daycare centers.
What are the symptoms of strep throat?
Streptococcal pharyngitis usually develops relatively suddenly.
The most common symptoms include:
- Fever
- Severe sore throat
- Pain when swallowing
- Red and swollen tonsils, with or without white exudates
- Swollen and tender lymph nodes in the neck
- Headache
- Abdominal pain
- Nausea or vomiting
- Small red spots on the roof of the mouth (palatal petechiae)
- In some cases, a characteristic rash, as seen in scarlet fever
In children younger than 3 years, the clinical presentation may be different and less characteristic. Fever, irritability, decreased appetite, and nasal discharge may occur.
When is a viral infection more likely?
Certain symptoms are more suggestive of a viral infection.
For example:
- Cough
- Runny nose
- Hoarseness
- Conjunctivitis
- Oral ulcers
- Diarrhea
When clear symptoms of a viral infection are present, testing for streptococcus is usually not necessary.
In contrast, when a child has a sore throat without typical viral symptoms, a clinical examination by the pediatrician and, when indicated, laboratory testing can help establish the correct diagnosis.
Does every child with a sore throat need a strep test?
No.
Clinical findings alone cannot always reliably distinguish streptococcal from viral pharyngitis when clear viral symptoms are absent.
The pediatrician considers the child's age, symptoms, and clinical examination as a whole and determines whether diagnostic testing is needed.
In children younger than 3 years, typical streptococcal pharyngitis is uncommon, and testing is generally not performed unless there are specific reasons, such as close contact with a confirmed case or other risk factors.
How is the diagnosis made?
The main tests used to detect streptococcus are:
1. Rapid strep test
The rapid strep test is performed by collecting a throat swab and provides a result quickly.
A positive strep test in a child with a compatible clinical presentation supports the diagnosis of streptococcal pharyngitis and leads to antibiotic treatment.
2. Throat culture
A throat culture is an important test for confirming the diagnosis.
In children and adolescents with a compatible clinical presentation, when the rapid strep test is negative, confirmation with a throat culture is recommended.
Why can the strep test be negative even when a child has streptococcus?
The rapid strep test is quick and useful, but it is not as sensitive as a throat culture.
Therefore, a negative rapid test does not always rule out streptococcal infection in a child with a compatible clinical presentation.
For this reason, in children older than 3 years, a negative rapid strep test should generally be confirmed with a throat culture.
When are antibiotics needed?
If streptococcal pharyngitis is confirmed by a positive rapid strep test or a positive throat culture, antibiotic treatment is given according to the pediatrician's recommendations.
Penicillin or amoxicillin are the usual first-line treatments when there is no contraindication.
The duration of treatment depends on the antibiotic used. For penicillin and amoxicillin, the recommended treatment course for streptococcal pharyngitis is usually 10 days.
Antibiotics should not be given to children with uncomplicated viral pharyngitis.
Correct diagnosis is therefore important both for treating streptococcal infection and for avoiding unnecessary antibiotic use.
Why is treatment of streptococcal pharyngitis important?
Appropriate antibiotic treatment:
- Reduces the duration of symptoms
- Reduces transmission of streptococcus
- Reduces the risk of complications
One of the important complications we aim to prevent is acute rheumatic fever.
Local complications may also occur, such as peritonsillar abscess or other types of abscess, as well as other infections.
What does it mean to be a streptococcal carrier?
Some children may have streptococcus in their throat without having any symptoms. They are referred to as carriers.
This is important because a child who is a carrier and develops a viral infection at the same time may have a positive strep test even though streptococcus is not the cause of the symptoms.
Distinguishing between an active streptococcal infection and carriage cannot always be done based solely on the result of a test. The child's clinical presentation and medical history need to be considered together.
Asymptomatic carriers generally do not require antibiotic treatment.
When can a child return to school?
A child with confirmed streptococcal pharyngitis can generally return to school or daycare when:
- The child is fever-free and feels well, and
- At least 12–24 hours have passed since starting appropriate antibiotic treatment.
The exact timing may vary depending on the individual case and the pediatrician's recommendations.
How can we reduce transmission?
Good hand hygiene and avoiding close contact with people who have symptoms help reduce transmission.
It is particularly important to cover the mouth and nose when coughing or sneezing and to wash hands frequently.
Routine preventive strep testing or antibiotic treatment is not recommended for everyone who has been in contact with a child with streptococcal pharyngitis. However, there are specific circumstances in which a pediatrician may recommend a different approach.
Frequently Asked Questions from Parents
Does every sore throat require a strep test?
No. Many cases of sore throat in children are caused by viruses. When clear symptoms of a viral infection are present, testing for streptococcus is usually not necessary.
If the strep test is negative, does the child need antibiotics?
Not without confirmation of the diagnosis. In children over 3 years of age with a compatible clinical presentation, a negative rapid strep test generally needs to be confirmed with a throat culture.
Can a child have streptococcus without having a sore throat?
Yes. Some children may be asymptomatic carriers. However, this does not mean that every positive test in a child with symptoms necessarily indicates an active streptococcal infection.
How many days of antibiotic treatment are needed?
For penicillin or amoxicillin, the recommended treatment course for streptococcal pharyngitis is usually 10 days. Treatment should be followed exactly as prescribed by the pediatrician.
When can the child return to school?
When the child is fever-free, feels well, and has completed at least 12–24 hours of appropriate antibiotic treatment.
Is follow-up testing needed after completing the antibiotic course?
In children who have completed treatment and are now symptom-free, follow-up testing is usually not necessary. Certain specific circumstances may require a different approach, according to the pediatrician's clinical judgment.
Conclusion
A sore throat in children does not necessarily mean a streptococcal infection, and not every child needs antibiotics.
Appropriate evaluation by the pediatrician, careful selection of children who need a strep test, and confirmation of the diagnosis when required help ensure that antibiotics are prescribed when they are truly needed.
In cases of high fever, severe sore throat, difficulty swallowing, difficulty breathing, significant illness, or worsening of the child's condition, prompt medical evaluation is required.
This article was reviewed by Pediatrician Katerina Dimitriou.
The information provided is for educational purposes only and does not replace a clinical examination or individualized medical advice.
I would be very happy to hear from you and answer any questions you may have.
Katerina Dimitriou, MD
Pediatrician–Neonatologist
Sources: UpToDate, CDC, IDSA