Strep throat is a bacterial infection that causes a sudden, severe sore throat, usually with fever and without the cough or runny nose of a cold. It is most common in school-age children but affects adults too. Unlike most sore throats, which are viral, strep needs antibiotics, to ease it and to prevent rare complications. A quick throat swab confirms it.
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What is strep throat?
Strep throat is an infection of the throat and tonsils caused by bacteria called group A streptococcus (group A strep). It is one of the few sore throats that is bacterial rather than viral, which matters because strep needs antibiotics while viral sore throats do not.
It is most common in children ages 5 to 15, and it is a frequent reason kids miss school, but adults get it too, especially parents and others around school-age children. The tricky part is that strep and a viral sore throat can look similar. Here is how they usually differ:
| Feature | Strep throat | Viral sore throat |
|---|---|---|
| How it starts | Often sudden | Often gradual |
| Cough, runny nose, hoarseness | Usually absent | Often present |
| Throat and tonsils | Very sore, red, sometimes with white patches | Sore, may be red |
| Fever | Common | Sometimes, often milder |
| Other signs | Swollen neck glands, headache, stomachache in kids | Cold-like symptoms |
| What it needs | Antibiotics, after a positive test | Sest and comfort care, no antibiotics |
Because you cannot reliably tell them apart by looking, a quick test is the only sure way to know.
What are the symptoms of strep throat?
Strep throat symptoms usually come on quickly. Common signs include:
- A sudden, painful sore throat
- Pain when swallowing
- Red, swollen tonsils, sometimes with white patches or streaks of pus
- Fever
- Swollen, tender lymph nodes in the neck
- Headache, and in children, stomachache or nausea
- Tiny red spots on the roof of the mouth
Strep throat usually does not come with a cough, runny nose, or hoarse voice. If those cold symptoms are present, a viral infection is more likely. In young children, strep can also show up as fussiness, trouble eating, and fever.
When should I see a doctor?
Because strep needs antibiotics and a viral sore throat does not, the main step is getting tested when strep is likely. Here is how to tell what to do.
Get tested with a provider or immediate care visit
See a provider if you or your child has a sore throat with fever, painful swallowing, swollen neck glands, or white patches on the tonsils, especially without cough or cold symptoms. A quick throat swab can confirm strep in minutes so the right treatment can start. Children with a sore throat and fever are worth testing, since treating strep helps prevent rare complications.
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Walk into a Duly Immediate Care Center
Get urgent or emergency care
Some throat symptoms need fast care. Seek urgent or emergency care for any of these:
Throat warning signs that need urgent care
- Trouble breathing or swallowing
- Drooling, or being unable to swallow saliva
- Difficulty opening the mouth
- A muffled voice with severe one-sided throat pain, which can signal an abscess
- A stiff neck or a very high fever
What causes strep throat and how does it spread?
Strep throat is caused by group A strep bacteria, which spreads easily through respiratory droplets when someone coughs, sneezes, or talks, and by sharing food, drinks, or utensils. It is most common in late fall through spring and spreads quickly in schools and households. Someone with strep is contagious until they have been on antibiotics for about 24 hours, which is why staying home until then, and until the fever is gone, helps protect others.
How is strep throat treated?
Strep throat is treated with antibiotics, usually penicillin or amoxicillin (with other options for those allergic to penicillin). Antibiotics ease symptoms a bit faster, make you non-contagious sooner, and, importantly, prevent the rare complications of untreated strep. It is important to finish the full course, even once you feel better, to fully clear the infection.
Easing symptoms
- Acetaminophen or ibuprofen for pain and fever
- Plenty of fluids, and cold or warm drinks that feel soothing
- Rest
- For older children and adults, salt-water gargles, throat lozenges, or warm tea
Most people feel better within a day or two of starting antibiotics and can return to school or work after 24 hours on antibiotics and once the fever is gone. Why treat strep at all? Untreated strep can occasionally lead to problems like rheumatic fever, which can affect the heart, or kidney inflammation, both of which antibiotics help prevent, particularly in children.
Can you prevent strep throat?
You cannot prevent every case, but good habits lower the risk and slow the spread. Washing hands often, covering coughs and sneezes, and not sharing cups, utensils, or food all help. If someone in the house has strep, using separate drinking glasses and washing them in hot, soapy water reduces spread. Replacing a toothbrush after a few days on antibiotics is a simple extra step.
Who treats strep throat?
Most strep throat is handled by a pediatrician or primary care provider. Pediatric, internal medicine, and family medicine providers, with the nurse practitioners and physician assistants on their teams, can do the throat swab, confirm strep, and prescribe antibiotics, often in a single quick visit. Immediate care visits make testing and treatment easy to access.
An ENT (ear, nose, and throat or otolaryngologist) specialist may get involved in some situations:
- Frequent or recurring strep and tonsillitis
- A throat abscess, or
- When tonsil removal is being considered
For children or adults who get strep again and again, an ENT can discuss whether removing the tonsils might help. Your provider coordinates care and refers to ENT when it would.
Frequently asked questions
How do I know if it’s strep throat or just a sore throat?
You often cannot tell for sure without a test, but some clues help. Strep tends to come on suddenly with a very sore throat, fever, and swollen neck glands, and usually without a cough or runny nose. A sore throat with a cough, congestion, or hoarseness is more likely viral. Because strep needs antibiotics, a quick throat swab is the only sure way to know.
Does strep throat need antibiotics?
Yes, if a test confirms strep. Antibiotics ease symptoms, make you non-contagious sooner, and prevent rare but serious complications like rheumatic fever, which is why strep is treated even though many sore throats are not. If a strep test is negative, the sore throat is likely viral and antibiotics will not help, so they should not be used.
How long is strep throat contagious?
Without treatment, strep can be contagious for one to two weeks. Once antibiotics have been taken for about 24 hours and the fever is gone, a person is generally no longer contagious and can return to school or work. Finishing the full course of antibiotics still matters, even after feeling better.
Can adults get strep throat?
Yes. Strep is most common in school-age children, but adults get it too, especially parents and people who work around children. The symptoms and treatment are the same: a throat swab to confirm it and antibiotics if it is positive. Adults with a sore throat plus fever and no cold symptoms are worth testing.
Where can I get tested for strep throat in Chicagoland?
Duly Health and Care offers pediatric and adult primary care, family medicine, video visits, and immediate care across the Chicago suburbs, where a quick throat swab can confirm strep and treatment can start the same visit. For recurring strep or tonsil problems, Duly ENT specialists can help.
Strep Throat Care at Duly Health and Care
A sore throat is one of the most common reasons families come in, and finding out quickly whether it is strep takes the guesswork out of treatment. Duly pediatric and primary care providers can do a fast throat swab, start antibiotics only when they are needed, often in a single visit through primary care or immediate care. When strep keeps coming back or tonsils are a recurring problem, they will coordinate your cae with Duly ENT specialists.
With pediatric and adult primary care, family medicine, and ENT expertise across the Chicago suburbs, plus video and immediate care, relief is easy to reach for the whole family.
Find same-day pediatric or primary care
Walk into a Duly Immediate Care Center
Medically reviewed by Duly Health and Care Pediatrician, Brett Hurliman, MD — Last reviewed June 2026
