Lab result explainedInflammationLast updated November 11, 2026

Strep test: what positive and negative rapid strep and throat culture results mean

Strep test · Throat swab: rapid antigen test, throat culture or molecular (PCR) test · reported in Qualitative: positive or negative (rapid antigen and molecular tests); growth or no growth of group A streptococcus (culture)

A strep test checks a swab from the back of your throat for Streptococcus pyogenes, the group A streptococcus that causes strep throat. There are three versions. The rapid antigen detection test (RADT, the 'rapid strep') gives a result in 5 to 10 minutes in the clinic. The throat culture grows the bacteria on an agar plate and takes 24 to 48 hours. Molecular tests (PCR or other nucleic acid amplification tests) detect the bacteria's DNA and return a result within an hour at clinics that have the equipment. All three answer the same question: is group A strep present on your throat right now? The result is reported as positive or negative, or for a culture as growth or no growth.

The test matters because most sore throats are not strep. Group A strep causes only about 20 to 30 percent of sore throats in children and 5 to 15 percent in adults; the rest are viral and antibiotics do nothing for them. A rapid strep test detects about 85 to 90 percent of true infections and is correct about 95 percent of the time when it says positive, so a positive result is acted on. A negative rapid test in a child or teenager is backed up with a throat culture, because missing strep in this age group carries a small risk of rheumatic fever. In adults, who rarely develop rheumatic fever, a negative rapid test is usually accepted as the final answer.

Two results puzzle people. The first is a negative test in someone who feels terrible: that is the expected result for the viral illnesses (adenovirus, mononucleosis, influenza, COVID-19) that cause most severe sore throats, and the swab is also occasionally falsely negative. The second is a positive test in someone with cold symptoms: about 12 percent of healthy school-age children carry group A strep on their throat without being ill, so a positive swab in a child with a runny nose and cough may be a carrier with a viral infection rather than strep throat. That is why guidelines recommend testing only when the symptoms fit, and not testing at all when a cough, hoarseness, runny nose or mouth ulcers point to a virus.

Strep test at a glance

  • What it is: a throat swab tested for group A streptococcus by rapid antigen test (minutes), throat culture (24–48 hours) or PCR (under an hour).
  • Positive: group A strep is present; with a sore throat, fever and no cough this is strep throat and is treated with antibiotics to shorten illness, reduce spread and prevent rheumatic fever.
  • Negative rapid test: in children and teenagers a backup throat culture is sent; in adults a negative rapid test usually ends the work-up because rheumatic fever is rare after age 21.
  • Accuracy: rapid tests find about 85–90% of true infections (specificity about 95%); culture about 90–95%; PCR about 97–99%.
  • A negative test with a bad sore throat usually means a virus; mononucleosis, adenovirus, influenza and COVID-19 are the common culprits. Group C or G strep and Fusobacterium are occasional bacterial causes not detected by the rapid test.
  • Next step: a positive result is treated and you are no longer contagious after about 12–24 hours of antibiotics; a negative result in a child waits for the culture; no repeat test is needed after treatment unless symptoms return.

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What Strep test measures

The rapid antigen test detects a carbohydrate molecule in the cell wall of group A streptococcus (the Lancefield group A antigen). The swab is mixed with an acid that extracts the carbohydrate, and the fluid flows along a test strip coated with antibodies that bind it, producing a colored line, much like a pregnancy test. It cannot detect group C or G streptococci, which have a different carbohydrate, and it needs a certain number of bacteria on the swab, which is why a poorly taken swab, or a throat with only light growth, can give a false negative.

The throat culture spreads the swab across a sheep-blood agar plate and incubates it. Group A strep produces a clear halo of destroyed red cells (beta-hemolysis) and is confirmed with a bacitracin disk or an antigen test on the colony. Most labs read the plate at 24 hours and again at 48 before calling it negative, and some report how heavy the growth is (rare, few, moderate or many, or 1+ to 4+). Molecular tests amplify a piece of the bacterium's DNA; they are as sensitive as culture or better and do not need a backup culture, but they can stay positive for a while after effective treatment because they detect dead bacteria too.

How the swab is taken matters more than most people realize. Both tonsils and the back wall of the throat should be rubbed firmly, without touching the tongue, cheeks or teeth, which dilute the sample. Antibiotics taken in the preceding days can make the rapid test and culture negative while symptoms continue. Separately, blood tests for antibodies against strep (ASO and anti-DNase B) measure a past infection weeks later and are used to investigate rheumatic fever or post-streptococcal kidney inflammation; they are not used to diagnose a sore throat.

Normal range for Strep test

Reference ranges vary between labs and by age, sex and pregnancy. Use the range printed on your own report.

GroupTypical range (Qualitative: positive or negative (rapid antigen and molecular tests); growth or no growth of group A streptococcus (culture))Notes
Rapid antigen test, negativeNo group A strep antigen detectedIn children and adolescents a backup throat culture is sent because the rapid test misses about 10 to 15 percent of infections. In adults a negative rapid test is usually final.
Rapid antigen test, positiveGroup A strep antigen detectedAbout 95 percent specific; treated without waiting for a culture. In a child with clear cold symptoms, consider that the child may be a carrier with a viral illness.
Throat culture, no growthNo beta-hemolytic streptococci at 24–48 hoursMost labs issue a preliminary report at 24 hours and a final report at 48. Antibiotics taken before the swab can produce a false negative.
Throat culture, positiveGroup A beta-hemolytic streptococcus isolated; some labs grade growth from 1+ (rare) to 4+ (many)Heavier growth favors true infection over carriage, but the grade is not reliable enough on its own to separate the two.
Culture positive for group C or G strepNon-group A beta-hemolytic streptococcus isolatedThese can cause sore throats, mainly in teenagers and adults, and are not detected by the rapid test. They do not cause rheumatic fever; whether to treat is judged on symptoms.
Molecular (PCR / NAAT) testDetected or not detectedSensitivity about 97 to 99 percent, so no backup culture is needed. Can remain positive for days to weeks after successful treatment and also detects carriage.
ASO titer (blood test for past infection)Under about 200 IU/mL in adults; under about 300 IU/mL in school-age children, depending on the labRises 1 to 3 weeks after a strep infection and peaks at 3 to 5 weeks. Used to investigate rheumatic fever or post-streptococcal glomerulonephritis, not to diagnose a current sore throat.
Centor / McIsaac score (who should be tested)0–1: testing not recommended; 2–3: test; 4–5: test, or some clinicians treat on the score aloneOne point each for fever over 100.4°F (38°C), tonsillar swelling or pus, tender swollen front-of-neck glands, and no cough; plus one point for age 3 to 14, minus one for age 45 and over.

Positive strep test

A positive rapid strep test, throat culture or PCR means group A streptococcus is present on your throat. With a sore throat, fever, swollen tender glands in the front of the neck, pus on the tonsils and no cough, that is strep throat, and antibiotics are prescribed. Treatment shortens the illness by about a day, makes you non-contagious within 12 to 24 hours, lowers the chance of complications such as a peritonsillar abscess, and, if started within nine days of the first symptoms, prevents rheumatic fever, the heart-damaging immune reaction that used to be the main reason strep was feared. Penicillin or amoxicillin remains the standard choice because group A strep has never developed resistance to it.

A positive result does not always mean the strep is what is making you ill. Group A strep lives harmlessly on the throat of roughly 12 percent of healthy school-age children (fewer adults), and a carrier who catches a cold will test positive even though the virus is the problem. Clues that a positive swab reflects carriage rather than infection are a runny nose, cough, hoarseness or conjunctivitis, a positive test at every sore throat over months, and a child who does not improve on antibiotics despite the positive test. Carriers are at very low risk of rheumatic fever and rarely spread the bacteria, so they are not usually treated unless there is a specific reason, such as repeated spread within a family or a household member with rheumatic fever.

In culture reports, a positive for group C or G strep is a different organism. These streptococci cause a strep-throat-like illness in teenagers and adults, sometimes in outbreaks, but they do not cause rheumatic fever, and treatment is optional and based on how unwell you are. A positive test weeks after a treated infection is usually a new infection, a carrier state or (with PCR) leftover bacterial DNA, not a sign the antibiotics failed, and a repeat swab after treatment is not recommended unless symptoms come back.

Common causes

  1. Strep throat (group A streptococcal pharyngitis)

    The expected reason for a positive test in someone with sudden sore throat, fever and tender neck glands, typically aged 5 to 15, in winter and early spring. Spread is by droplets, and about a quarter of household contacts of a case become infected.

  2. Scarlet fever

    Strep throat caused by a strain that makes an erythrogenic toxin, producing a fine, sandpaper-like red rash on the trunk and skin folds and a 'strawberry tongue' a day or two after the sore throat begins. The throat test is positive and treatment is the same.

  3. Carrier with a viral sore throat

    Up to 12 percent of healthy school-age children carry group A strep. When they catch a cold or adenovirus the swab is positive, but the symptoms (runny nose, cough, red eyes) are viral. Carriage can persist for months and does not need treatment in most cases.

  4. Recently treated infection (molecular tests)

    PCR detects DNA from dead bacteria and can stay positive for days to a few weeks after effective antibiotics. A positive PCR shortly after treatment without new symptoms does not mean failure.

  5. Household or classroom exposure

    Siblings and parents of a child with strep throat often become colonized or infected within a week. Testing contacts is only recommended when they develop symptoms, except in families with a history of rheumatic fever.

  6. Peritonsillar abscess or other suppurative complication

    A collection of pus beside the tonsil, usually on one side, follows an untreated or partially treated strep infection in teenagers and adults and tests positive. It causes severe one-sided pain, a muffled 'hot potato' voice and difficulty opening the mouth.

  7. Group C or G streptococcus (culture only)

    Reported by the lab as a non-group A beta-hemolytic strep. It causes pharyngitis mainly in older teenagers and adults and in food-borne outbreaks, is not detected by the rapid test, and does not lead to rheumatic fever.

Symptoms that can go with it

  • Sudden sore throat, painful swallowing and fever, typically 101°F (38.3°C) or higher
  • Red, swollen tonsils, often with white or yellow patches of pus; tiny red spots on the roof of the mouth
  • Tender, swollen lymph nodes at the front of the neck
  • Headache, stomach ache, nausea or vomiting, especially in children
  • A fine red sandpaper rash and bright red tongue with scarlet fever
  • Absence of cough, runny nose and hoarseness, which are the features that point to a virus instead
  • In a carrier, the symptoms of whatever viral infection prompted the test, with little response to antibiotics

Negative strep test

A negative strep test means no group A strep was found on the swab. In most people this is a true negative: the sore throat is caused by a virus. Adenovirus, rhinovirus, enteroviruses, influenza, COVID-19 and the Epstein-Barr virus of mononucleosis together account for the large majority of sore throats, including many of the most painful ones with high fever and pus on the tonsils. For these, antibiotics do not help, and treatment is pain relief, fluids and time; most viral sore throats are improving within 3 to 5 days, while mono can take 2 to 4 weeks.

A negative test can also be wrong. The rapid antigen test misses about 10 to 15 percent of true strep infections, usually because the swab did not pick up enough bacteria. That is why a negative rapid test in a child or teenager is followed by a throat culture, which catches most of the missed cases over the next 24 to 48 hours, and why adults with a convincing picture and a negative rapid test are sometimes swabbed again or tested by PCR. Antibiotics taken in the days before the swab, for any reason, can also suppress the bacteria enough to give a negative result.

A few bacterial causes of sore throat are not detected by a strep test at all. Group C and G streptococci grow on a culture but are missed by rapid tests. Fusobacterium necrophorum is an increasingly recognized cause of severe sore throat in 15 to 30 year olds and is not detected by any routine throat test; it matters because it can rarely spread to the jugular vein and lungs (Lemierre syndrome), signaled by worsening one-sided neck pain and swelling, rigors and breathlessness a few days into the illness. Gonorrhea can infect the throat after oral sex and needs a specific test. If you have a negative strep test and are getting worse rather than better after 3 to 5 days, the diagnosis should be revisited rather than assumed.

Common causes

  1. Viral pharyngitis

    The most common reason: adenovirus (often with red eyes), rhinovirus and other cold viruses, enteroviruses in summer, influenza and COVID-19. Cough, runny nose, hoarseness and mouth ulcers point to a virus and lower the chance of strep to under 5 percent.

  2. Infectious mononucleosis (Epstein-Barr virus)

    Causes a severe exudative sore throat with large glands at the back as well as the front of the neck, marked fatigue and sometimes a swollen spleen, most often at ages 15 to 24. A mono spot or EBV antibody test and a blood count showing atypical lymphocytes make the diagnosis.

  3. Poor swab technique

    A swab that touches the tongue, cheeks or saliva instead of rubbing both tonsils and the back wall of the throat picks up too few bacteria for the rapid test's threshold. This is the usual reason for a false negative, and a reason home swabs can under-perform.

  4. Antibiotics taken before the swab

    Even one or two doses of an antibiotic, including leftovers or a course for something else, can suppress growth enough to turn the rapid test and culture negative while symptoms continue.

  5. Group C or G strep, Fusobacterium or other bacteria

    Group C and G streptococci grow on culture but are missed by rapid tests. Fusobacterium necrophorum (teenagers and young adults), Arcanobacterium haemolyticum (sore throat with a rash), Mycoplasma and throat gonorrhea are not detected by routine strep testing.

  6. Non-infectious throat pain

    Post-nasal drip from allergies or sinusitis, acid reflux, dry indoor air, mouth breathing, smoking or vaping, and voice strain cause persistent sore throats that test negative and do not come with fever.

  7. Peritonsillar abscess, epiglottitis or other deep infection

    These can test negative on a surface swab while being serious. Severe one-sided pain, drooling, a muffled voice, inability to open the mouth or noisy breathing are diagnosed by examination and imaging, not by the strep test.

Symptoms that can go with it

  • Sore throat accompanied by cough, runny or blocked nose, hoarseness, sneezing or red eyes (viral pattern)
  • Extreme tiredness, swollen glands at the back of the neck and under the arms, or a tender upper left abdomen (mononucleosis)
  • Blisters or ulcers in the mouth or on the hands and feet (enterovirus)
  • Sore throat that is worse in the morning, with heartburn or a dry home (reflux, post-nasal drip, dry air)
  • Worsening one-sided throat and neck pain, swelling, rigors or breathlessness several days in (Fusobacterium, abscess), which need urgent review
  • Fever persisting more than 3 to 5 days, or symptoms getting worse rather than better, which warrants re-examination

Read it alongside

  • Throat culture — the backup test after a negative rapid strep in anyone under about 21; the final answer arrives in 24 to 48 hours.
  • Mono spot (heterophile antibody) and EBV antibodies — for a severe sore throat with marked fatigue and glands at the back of the neck, especially at ages 15 to 24.
  • Complete blood count with differential — atypical lymphocytes point to mono; a high neutrophil count fits bacterial infection; a very low white count after a sore throat is a drug reaction until proven otherwise.
  • CRP — modestly raised in viral and bacterial pharyngitis alike; a very high value (over 100 mg/L) with a severe sore throat raises concern for an abscess or Lemierre syndrome.
  • ASO and anti-DNase B titers — rise 1 to 5 weeks after a strep infection; ordered when joint pain, heart symptoms, jerky movements or kidney inflammation appear after a sore throat.
  • Urinalysis — blood and protein in the urine 1 to 3 weeks after a strep infection suggests post-streptococcal glomerulonephritis.
  • Influenza and COVID-19 tests — sore throat with cough, body aches and fever in season is more often one of these than strep.
  • Gonorrhea NAAT of a throat swab — for a persistent sore throat after oral sexual contact; it is not detected by a strep test.

What usually happens next

  1. A positive test with symptoms of strep throat is treated with a 10-day course of penicillin or amoxicillin (or an alternative if you are allergic); expect to feel better within 24 to 48 hours and stay home until you have had at least 12 to 24 hours of antibiotics and no fever.
  2. A negative rapid test in a child or teenager means waiting for the throat culture; most clinics call only if it turns positive, so ask how results will be delivered. Antibiotics are not started in the meantime unless the child is very unwell.
  3. A negative test in an adult with a convincing picture may be followed by a repeat swab or a PCR test, or by a mono test and blood count if fatigue and large glands dominate.
  4. If a child tests positive at every sore throat, ask whether they could be a carrier; a culture taken when they are well, 2 to 3 weeks after finishing antibiotics, answers the question, and carriers are usually left untreated.
  5. No repeat swab is needed after treatment to confirm the bacteria are gone. A new sore throat with fever weeks later is swabbed again as a new episode. Repeated true infections (three or more in a year) are a reason to discuss household contacts and, rarely, tonsillectomy.
  6. Anyone with a strep infection who develops joint pains, breathlessness, chest pain, jerky movements, a new rash, or dark or frothy urine in the following 1 to 5 weeks needs review for rheumatic fever or glomerulonephritis.

Diet, lifestyle and natural levers with evidence

What can move Strep test once the cause is known. Nothing here replaces finding the cause.

Get the swab right: technique and timing decide the result

Strong evidence

Nothing you eat or take changes whether group A strep is on your throat, but the swab does. Studies comparing swabs show that rubbing both tonsils and the posterior pharynx raises rapid-test sensitivity to about 90 percent, while swabs contaminated by the tongue or saliva fall well below that. Do not take antibiotics before testing, do not use an antiseptic throat spray or lozenge in the hour beforehand, and tell the clinician about any antibiotic in the past week. If you use a home test, swab firmly at the back of the throat, not the mouth, and treat a negative in a child as provisional until a clinic culture confirms it.

Streptococcus salivarius K12 for children with recurrent strep throat

Preliminary evidence

This oral probiotic strain produces bacteriocins that inhibit group A strep in the laboratory. Small Italian studies in children with recurrent strep pharyngitis reported about 90 percent fewer streptococcal episodes over 90 days of use compared with untreated controls, but they were not placebo-controlled, and a later placebo-controlled randomized trial found no reduction in strep pharyngitis. It may be worth discussing for a child with four or more episodes a year; it will not change the result of a swab taken during an illness.

Not a substitute for antibiotics in an active infection. Do not use in children with central venous lines or significant immune suppression without medical advice.

Stop household spread

Moderate evidence

About a quarter of household contacts of a child with strep throat acquire the bacteria. Spread falls sharply once the patient has taken 12 to 24 hours of antibiotics, and hand washing, not sharing cups, utensils or toothbrushes, and covering coughs reduce transmission of respiratory bacteria in household and school studies. Contacts are tested only if they develop symptoms; routine swabbing or treatment of well family members is not recommended, except where a family member has had rheumatic fever.

When to see a clinician promptly

  • Difficulty breathing, noisy breathing, drooling, inability to swallow saliva, or a muffled voice with a severe sore throat: possible epiglottitis or peritonsillar abscess, call emergency services or go to an emergency department.
  • Severe pain and swelling on one side of the throat or neck, rigors, or breathlessness developing a few days into a sore throat, particularly at ages 15 to 30 (peritonsillar abscess or Lemierre syndrome): same-day assessment.
  • A positive strep test and no improvement within 48 hours of starting antibiotics, or a fever returning after it had settled.
  • Sore throat with a sandpaper-like rash and fever (scarlet fever), or a sore throat lasting more than a week, or a negative test with symptoms getting worse after 3 to 5 days.
  • In the 1 to 5 weeks after a strep infection: painful swollen joints, chest pain, breathlessness, jerky uncontrollable movements, a new rash or lumps under the skin (rheumatic fever), or dark, cola-colored or frothy urine and puffy eyes (post-streptococcal glomerulonephritis).
  • A child who is drinking very little, has not passed urine in 8 to 12 hours, is unusually drowsy or floppy, or has a stiff neck.

Frequently asked questions

How accurate is a rapid strep test?

Pooled studies in children put the rapid antigen test's sensitivity at about 86 percent and its specificity at about 95 percent, meaning it misses roughly 1 in 7 true infections but rarely calls a healthy throat positive. Accuracy depends heavily on how well the swab was taken. Throat culture detects about 90 to 95 percent of infections and PCR about 97 to 99 percent, which is why a negative rapid test in a child is checked with one of those.

Can a strep test be negative and you still have strep?

Yes. About 10 to 15 percent of true strep infections give a negative rapid test, usually because the swab picked up too few bacteria or antibiotics had already been taken. That is the reason children and teenagers with a negative rapid test have a backup throat culture, which catches most of the missed cases. In adults a false negative matters less because rheumatic fever is very rare, but a repeat swab or PCR is reasonable if the picture is convincing.

Why am I still sick after a negative strep test?

Most often because the illness is viral. Adenovirus, influenza, COVID-19 and especially mononucleosis cause sore throats that are as painful as strep, with fever and pus on the tonsils, and last 5 days to several weeks. If you are getting worse rather than better after 3 to 5 days, have severe one-sided pain or neck swelling, or cannot swallow, go back: group C or G strep, Fusobacterium, a peritonsillar abscess or mono may be the explanation, and none of these shows up on a rapid strep test.

How long does a throat culture take to come back?

Usually 24 to 48 hours. Many labs issue a preliminary reading at 24 hours and a final result at 48 hours, because light growth can take the second day to appear. Most clinics only call if the culture is positive, so it is worth asking how you will hear. PCR tests, where available, give an answer in under an hour and do not need a backup culture.

Are at-home strep tests accurate?

Home rapid strep tests use the same antigen chemistry as the clinic test, so their best-case accuracy is similar, around 85 to 90 percent sensitivity. In practice they are often less accurate because self-swabbing or swabbing a struggling child tends to miss the tonsils. A positive home test is reliable enough to act on by contacting a clinician for antibiotics. A negative home test in a child or teenager should not be the final word; a clinic culture or PCR is still advised if the symptoms fit strep.

Can you be a strep carrier?

Yes. About 12 percent of healthy school-age children, and a smaller share of adults, carry group A strep on their throat without illness, sometimes for months. Carriers test positive whenever they are swabbed, including during colds, which leads to unnecessary antibiotics. Carriers are at very low risk of rheumatic fever and rarely infect others, so treatment is usually not recommended. A culture taken when the child is well, 2 to 3 weeks after finishing antibiotics, is how carriage is confirmed.

Do I need a strep test if I have a cough and runny nose?

Usually not. Cough, runny nose, hoarseness, sneezing, red eyes and mouth ulcers are features of viral infections, and with them the chance that a sore throat is strep falls below about 5 percent. Testing in that situation mostly finds carriers and leads to antibiotics that do not help. Guidelines reserve testing for sore throats with fever, swollen tonsils or pus, tender front-of-neck glands and no cough, and for children under 3 only when a household member has strep.

How long am I contagious after a positive strep test?

Untreated strep throat is contagious for 2 to 3 weeks, even after symptoms improve. Once you start an appropriate antibiotic you are generally considered non-contagious after 12 to 24 hours, provided your fever has settled, and most schools and workplaces use that as the return threshold. Finish the full course even when you feel well, because stopping early allows the bacteria to persist and is the main avoidable reason for recurrence.

References

  1. Strep A test. MedlinePlus, US National Library of Medicine (2024)View source
  2. Clinical guidance for group A streptococcal pharyngitis. Centers for Disease Control and Prevention (2024)View source
  3. Shulman ST, Bisno AL, Clegg HW, et al.. Clinical practice guideline for the diagnosis and management of group A streptococcal pharyngitis: 2012 update by the Infectious Diseases Society of America. Clinical Infectious Diseases (2012)
  4. Cohen JF, Bertille N, Cohen R, Chalumeau M. Rapid antigen detection test for group A streptococcus in children with pharyngitis. Cochrane Database of Systematic Reviews (2016)
  5. Shaikh N, Leonard E, Martin JM. Prevalence of streptococcal pharyngitis and streptococcal carriage in children: a meta-analysis. Pediatrics (2010)
  6. Kalra MG, Higgins KE, Perez ED. Common questions about streptococcal pharyngitis. American Family Physician (2016)
  7. Centor RM, Witherspoon JM, Dalton HP, Brody CE, Link K. The diagnosis of strep throat in adults in the emergency room. Medical Decision Making (1981)
  8. McIsaac WJ, Kellner JD, Aufricht P, Vanjaka A, Low DE. Empirical validation of guidelines for the management of pharyngitis in children and adults. JAMA (2004)
  9. Strep throat. Mayo Clinic (2024)View source
  10. Streptococcal infections. Merck Manual Professional Version (2024)
  11. Di Pierro F, Colombo M, Zanvit A, Risso P, Rottoli AS. Use of Streptococcus salivarius K12 in the prevention of streptococcal and viral pharyngotonsillitis in children. Drug, Healthcare and Patient Safety (2014)
  12. Centor RM, Atkinson TP, Ratliff AE, et al.. Expanding the paradigm for the diagnosis of pharyngitis: Fusobacterium necrophorum. Annals of Internal Medicine (2015)

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This page is educational and is not medical advice or a diagnosis. Lab results have to be interpreted together with your history, symptoms and other results by a clinician who knows you. Do not start or stop a supplement to change a lab value before the cause is known.