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Strep Throat: In Adults, Symptoms, Contagious, Treatment, Antibiotics & Causes

Medically Reviewed on 4/22/2022

Strep throat is a bacterial infection of the soft palate and tonsillar region.Source: 1.Getty Images

What should I know about strep throat?

  • Strep throat is a type of infection caused by group A Streptococcus (GAS) bacteria that results in a sore, inflamed throat.
  • Most sore throats are caused by viruses, not strep bacteria.
  • Symptoms of strep throat in adults, middle-aged children, and adolescents include:
    • Sore throat (90%)
    • Headache (85%)
    • Fever (85%)
    • Upset stomach (65%)
  • Symptoms of strep throat in infants and toddlers may also include a thick nasal discharge, reduced appetite, fussiness, and swollen lymph nodes.
  • Symptoms associated with an upper respiratory infection (a “cold”), such as nasal congestion, muscle aches, and oral blisters, are typically absent with strep throat.
  • Strep throat is highly contagious and is usually spread through direct person-to-person contact.
  • The diagnosis of strep throat is established either via a rapid strep test (RADT) or a throat culture.
  • Strep throat is cured with antibiotic therapy.
  • While rare, there are several complications that may develop from a strep throat infection.

Strep Throat Symptoms & Signs

White Spots on Tonsils

White spots can be seen on the tonsils with a variety of medical conditions, most commonly infections of the tonsils. The tonsils can be involved in bacterial infections, such as strep throat, or viral infections such as infectious mononucleosis. A white coating on the tonsils is typical of many infections. Leukoplakia causes thick white patches on the inside surface of the mouth and can be related to injury or irritation. Cancer of the tonsils is rare but could cause a nodule or spot on a tonsil. Depending on the cause, white spots on the tonsils can be associated with signs and symptoms like

  • fever,
  • sore throat,
  • cough,
  • nasal congestion,
  • sneezing, or
  • other symptoms.

Microbiologists identify the member of the Streptococcus bacterial family that causes strep throat as “GAS” (Group A, beta-hemolytic, Streptococcus pyogenes).Source: iStock

What is strep throat? What causes it?

Strep throat is a bacterial infection of the soft palate and tonsillar region. Microbiologists identify the member of the Streptococcus bacterial family that causes strep throat as “GAS” (Group A, beta-hemolytic, Streptococcus pyogenes).

Who gets strep throat?

Strep throat is most common in young children and adolescents, but it can also occur in toddlers and adults. Strep throat is highly contagious and it is present most commonly in the community during the winter months. Symptoms and physical signs of strep throat may vary depending upon the age of the person infected.

Strep throat is highly contagious and is most commonly spread via direct person-to-person contact.Source: iStock

Is strep throat contagious?

Strep throat is highly contagious and is most commonly spread via direct person-to-person contact.

  • The incubation period (the time it takes from exposure to the infection to the appearance of symptoms) for strep throat is two to five days.
  • Passage of airborne droplets and/or saliva from the infected individual to another is the most likely mechanism of contracting strep throat. Close quarters (such as the home, classroom, daycare centers, college dorms, etc.) provide an ideal environment for the passage of strep bacteria from one person to another.
  • The risk of contracting a strep throat infection is approximately 40% in household environments.
  • Most infectious disease specialists believe that a patient is no longer contagious after 24 hours of effective antibiotic therapy.
  • The spread of strep bacteria via food-borne transmission is less common than a direct person-to-person exchange of droplets or saliva.
  • The exact likelihood of developing strep throat from family pets is unknown, but most experts believe it is minimal.

How long does strep throat last?

Strep throat will usually get better on its own within two to five days, however, you may start feeling better within a day or two after antibiotics are started. Strep throat remains contagious for the first 24 hours after starting antibiotics, so it is recommended that people stay home from work or school to avoid spreading the infection.

Typically, an older child and adolescent will experience symptoms such as fever (generally 102 F [38.8 C] and higher), sore throat, headache, upset stomach with nausea.Source: Medscape

What are the common signs and symptoms of strep throat?

Signs of strep throat are not unique – many viral infections (which cause the majority of sore throats) can have identical signs and symptoms as a group A strep (GAS) infection. Typically, an older child and adolescent will experience symptoms such as:

  • Fever (generally 102 F [38.8 C] and higher)
  • Sore throat (may vary from mild to moderate in severity)
  • Headache
  • Upset stomach with nausea, occasionally severe enough to cause vomiting

Runny nose, cough, hoarse voice, muscle aches, diarrhea, and oral blisters are generally not seen with a strep throat infection. These symptoms usually indicate a sore throat caused by a virus.

Adults with strep throat may have milder symptoms that may not prompt a medical evaluation unless an exposure history to strep throat is known.


Sore Throat or Strep Throat? How to Tell the Difference
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Redness of the soft palate, uvula (the “punching bag” structure hanging from the back of the soft palate), and tonsils.Source: Getty Images

What are other signs and symptoms of strep throat?

Other signs and symptoms of a strep throat infection may include:

  • Redness of the soft palate, uvula (the “punching bag” structure hanging from the back of the soft palate), and tonsils. Commonly, the tonsils may have a bumpy look on their surface – somewhat like a golf ball
  • White or yellow-colored spots on the tonsils (tonsillar exudate)
  • Petechiae (look like 1-2 mm bright red “dots” which represent ruptured capillaries) scattered on the soft palate
  • Enlarged and tender neck lymph nodes (also known as lymph glands)
  • A diffuse rash over the torso and groin region. The classic description of this rash is that it looks like “goose bumps on a moderate sunburn”. The presence of a strep infection and this specific rash is termed scarlet fever. This diagnosis does not imply a more severe strep infection or imply any change in prognosis or management. The rash is not contagious. Some individuals who develop scarlet fever may also experience peeling of the skin of the fingertip pads.

While most patients with strep throat will experience these signs and symptoms, not all will necessarily be present in each individual.

A doctor examines a young girl’s mouth for strep throat.Source: iStock

Are the signs and symptoms of strep throat in infants and toddlers?

The information above is seen in those most likely to have a strep throat infection, including older children and teenagers. However, other age groups may experience some different symptoms with a strep throat infection.

  • Infants with strep throat more commonly have a thick nasal discharge, low-grade fever (
  • Toddlers (children from one to three years of age) with strep throat may complain of a sore throat and a subsequent decrease in appetite, and swollen lymph nodes in the front of the neck beneath the mandible (lower jaw bone).


Strep Throat (Treatment, Causes, Home Remedies)
See a picture of strep throat and other oral health conditions
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A doctor performs a throat culture on his patient to test for strep throat.Source: iStock

What tests diagnose strep throat?

There are two common tests used to diagnose strep throat the rapid strep test (RADT) and traditional throat culture.

Rapid strep test (RADT)

  • Many medical offices, clinics, and hospital emergency departments use a rapid strep test (RADT – rapid antigen detection test) to diagnose strep throat.
  • A throat swab is obtained from the back of the throat and tonsils, and a RADT “kit” is employed to help determine the presence or absence of the strep bacteria.
  • The turnaround time for the results of the test generally is 10 minutes.
  • RADT tests are about 70%-95% accurate in determining the presence of strep bacteria.
  • Most guidelines recommend that a negative rapid strep test be confirmed with a throat culture, which can take a few days to get the results.
  • Antibiotic pretreatment prior to obtaining a throat swab for strep bacteria can interfere with throat culture results, and thus the ability to correctly diagnose and treat a strep throat infection. Antibiotic treatment prior to a rapid strep test is less likely to have a false negative result since the test is designed to document the presence or absence of the GAS bacteria. Residual dead bacteria in the patient may allow a positive result.

Throat culture

The traditional test, a throat culture, involves obtaining a swab from the back of the throat and tonsils. It takes approximately 24 to 48 hours to determine the presence or absence of the group A strep bacteria. This test is typically more accurate in diagnosing strep throat than the rapid strep test.

Blood tests for the history of strep infection

The rapid strep and throat culture tests are designed to determine whether an individual currently has a strep throat infection. Sometimes it may be necessary to determine whether a patient has had a recent history of a strep infection. In that case, two blood tests are available:

  • ASO (antistreptolysin O) titer
  • Anti-DNase titer

The antibodies that these tests are sensitive to are not commonly present until a few weeks following an acute strep infection. These tests may be ordered when evaluating a patient who may have developed delayed complications (such as rheumatic fever or glomerulonephritis) after a strep throat infection.

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A man gargles with saltwater. Treatment of a strep throat infection includes the use of antibiotics and over-the-counter medications.Source: Getty Images

How is strep throat treated?

Treatment of a strep throat infection includes the use of antibiotics and over-the-counter medications and home remedies for the reduction of symptoms.

What natural and home remedies help soothe strep throat pain?

Several home remedies may be used to reduce the symptoms of strep throat. They may be used whether the patient has strep throat or a viral cause of their illness. These remedies should not be used instead of a complete course of antibiotics if a strep infection is being treated. Home remedies to soothe symptoms of strep throat include:

  • Saltwater gargle: mix ¼ to ½ teaspoon with 8 ounces of warm water. Young children may accidentally swallow the solution instead of gargling it and should thus avoid this approach.
  • Throat lozenges may be sucked on to reduce the symptoms of pain or throat dryness. Some lozenges contain topical anesthetics. Very young children should not be given throat lozenges, as they may be a choking hazard.
  • Throat sprays that contain topical pain relievers (benzocaine, phenol) may be used to relieve sore throat pain, though lozenges often provide more long-lasting relief.
  • Hot or cold foods and drinks: Ice cream, smoothies, popsicles, cold drinks, warm (not hot) broth-based soup, and warm tea with honey may help soothe the sore throat. Honey should be avoided in infants less than 1 year of age because of their increased likelihood of botulinum toxicity and paralysis.


Just about any painful sore throat is caused by strep.
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A woman taking medication pills for strep throat.Source: iStock

What over-the-counter (OTC) medication soothes strep throat pain?

Several over-the-counter (OTC) medications, such as acetaminophen (Tylenol) and nonsteroidal anti-inflammatory drugs (NSAIDs) such as ibuprofen (Advil and Motrin) can be used to lower the fever and provide pain relief for the sore throat. Aspirin should not be used in children or adolescents because of its association with Reye syndrome.

What antibiotics are prescribed to treat strep throat?

Antibiotics provide the mainstay for successfully treating a strep throat infection.

  • The group A strep bacteria are generally susceptible to the penicillin family, for example,
    • amoxicillin (Amoxil), and
    • the cephalosporin family, for example, cephalexin (Keflex), cefprozil (Cefzil), cefdinir (Omnicef) and others.
  • Members of the macrolide family, for example, erythromycin (E-mycin), azithromycin (Zithromax) and clarithromycin (Biaxin) generally are felt to be less effective than the other two classes of antibiotics, but are used in individuals with moderate penicillin or cephalosporin allergy. If such a patient cannot tolerate the macrolide family, clindamycin (Cleocin) is an alternative and very effective antibiotic option.
  • Regardless of what antibiotic is prescribed, it is important to finish the entire course of the antibiotic. Most patients will experience a rapid reduction in signs and symptoms within 24 to 48 hours of starting antibiotic therapy.
  • Viral throat infections do not require antibiotics since they provide no benefit.

Is it safe to take antibiotics for strep throat during pregnancy?

If a woman contracts strep throat during pregnancy, the same types of antibiotics are typically used for treatment. All penicillin-type and cephalosporin-type antibiotics are considered safe for pregnant women. Because fever is a common symptom of strep throat, pregnant women are advised to take fever-reducing medications such as acetaminophen (Tylenol). Aspirin and NSAID’s should be avoided during pregnancy. Consult your doctor if you are pregnant and you think you have strep throat, and follow your doctor’s instructions for medication use.

Which specialties of doctors treat strep throat?

Strep throat is typically diagnosed and treated by a primary care provider (PCP) such as a family practitioner, an internist, or a child’s pediatrician. If you go to a hospital’s emergency department, you will be seen by an emergency medicine specialist.

If you have recurring or chronic strep throat, you may be referred to an otolaryngologist, sometimes referred to as an ENT (ear, nose, and throat specialist) for treatment.


A doctor examines a young girl’s ears for infection.Source: iStock

What are potential complications of strep throat?

The possible complications of strep throat include:

  • Middle ear infection (otitis media)
  • Toxic shock syndrome (a rare severe complication that may result in multiple organ failure and sometimes death)
  • Peritonsillar abscess or retropharyngeal abscess (a walled-off collection of pus) containing GAS bacteria which typically requires drainage
  • Acute rheumatic fever (ARF): While rare, this complication of an untreated or inadequately treated strep infection can have devastating and lifelong consequences. It is believed that due to incomplete eradication of the strep bacteria, certain GAS organisms cause an immune response, which may attack the joints leading to permanent arthritis. More concerning is the autoimmune response to the heart valves, which may damage them and may result in heart failure. Many studies have shown that effective and appropriate antibiotic therapy for strep throat vastly reduces the likelihood of developing ARF.
  • Glomerulonephritis: Similar to the abnormal immune response seen with ARF, antibodies may develop and damage the microscopic filters (glomeruli) of the kidney. This complication more commonly affects children between 7 to 10 years of age. While more common than acute rheumatic fever, glomerulonephritis has a less serious prognosis. Effective treatment exists and most children make a complete recovery and do not experience any long-term kidney damage. Unlike ARF, the development of glomerulonephritis is not necessarily prevented by effective antibiotic treatment.
  • PANDAS (Pediatric Autoimmune Neuropsychiatric Disorder Associated with Strep): Specialists debate the proposed link of GAS infection in children with the development and/or worsening of obsessive-compulsive behaviors or tic disorder (Tourette’s syndrome in the extreme). One area being researched in this controversial condition is whether antibiotic therapy affects the development of, or the severity of, the disorder.

Wash your hands frequently after using items that may harbor the group A strep bacteria (for example, dishes and utensils). Don’t share food or drinks with a sick individual.Source: Getty Images

How can I prevent contracting strep throat?

There is no vaccine currently available to prevent strep throat, but there are several behaviors to lessen the likelihood of developing a strep throat infection. These include:

  • Avoid people with sore throats, and especially those with documented strep throat, until they have taken antibiotics for more than 48 hours.
  • Wash your hands frequently after using items that may harbor the group A strep bacteria (for example, dishes and utensils).
  • Don’t share food or drinks with a sick individual.
  • Encourage ill individuals to cover their nose and mouth when they sneeze or cough.

Medically Reviewed on 4/22/2022


American Pregnancy Association. “Strep Throat During Pregnancy.”

Schmitt, B.D., MD. “Strep Throat Exposure.” Seattle Children’s Hospital Research Foundation.

Stead, W., MD. “Patient education: Sore throat in adults (Beyond the Basics).” UpToDate. Updated: Nov 07, 2017.

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