Acute sore throat: Is it a virus or a bacteria?
When we open our mouths, we see the “throat” (tonsils, soft palate, uvula, back of the throat). This area—the oropharynx — is a common gateway to virus (in most cases) and, sometimes, from bacteria, such as Streptococcus Group A (“strep”). The result is pain when swallowing, a feeling of scratch, sometimes fever and ganglia the most sensitive areas of the neck. During the fall and winter (and early spring), transmission is more common. In addition, changes in temperature and humidity make the mucous membranes more sensitive and cause cases of oropharyngeal infection to skyrocket.
In school-aged children (5–15 years), up to 30% of acute oropharyngeal infections (AOIs) may be bacterial; in adults, the prevalence is 5–15%. Transmission is respiratory, and the typical incubation period is 2–5 days.
Determining whether the cause is a virus or a bacterium significantly affects the treatment to be used, but symptoms alone are not always enough to determine the cause and, consequently, the best treatment.
Virus or bacteria? What the symptoms tell us (and what they don't)
Symptoms suggestive of a viral infection: cough, runny nose, hoarseness, conjunctivitis, diarrhea, muscle aches.
Symptoms suggestive of a bacterial infection: sudden onset, severe sore throat, fever, absence of a cough, pus on the tonsils, headache, nausea/vomiting, abdominal pain, and, sometimes, a rash. However, observing these symptoms alone may not be sufficient, and the decision should be based on clinical criteria and testing when necessary.
Knowing this, the practical question is: How long does it last, and when do I need medical help.
In school-aged children (5–15 years), up to 30% of acute oropharyngeal infections (AOIs) may be bacterial; in adults, the prevalence is 5–15%. Transmission is respiratory, and the typical incubation period is 2–5 days.
Determining whether the cause is a virus or a bacterium significantly affects the treatment to be used, but symptoms alone are not always enough to determine the cause and, consequently, the best treatment.
How long does it last? When should I seek medical help?
Most sore throats improve within 3–7 days with simple measures.
Get a checkup if you have difficulty swallowing saliva, muffled voice, trism (difficulty opening the mouth), shortness of breath, severe unilateral pain that radiates toward the ear, skin rash, dehydration or if it belongs to at-risk groups (pregnancy, chronic illness, immunosuppression). In children, monitor persistent fever and fluid intake.
When symptoms do not suggest a “typical cold,” a rapid test can make a difference in the treatment approach.
When does it make sense to take a screening test at a pharmacy?
In cases where signs and symptoms are unclear, clinical observation alone cannot reliably distinguish bacterial pharyngitis from other causes. A rapid swab test can confirm or rule out the presence of Group A Streptococcus in the oropharynx within minutes.
At Correia Rosa Pharmacies, we offer screening tests for acute oropharyngeal infections, using a simple swab sample, and provide guidance after the results are available. → Learn more here.
Once we’ve determined the type of infection, we’ll help you relieve your symptoms.
What helps relieve the symptoms
- Acetaminophen or ibuprofen to relieve pain and fever; diclofenac and naproxen are alternatives for adults.
- Topical lozenges or sprays (benzidamine, flurbiprofen, local anesthetics, antiseptics such as cetylpyridinium chloride or hexetidine) can provide local relief.
- Non-pharmacological measures with evidence and practical utility:
- Stay hydrated (6–8 glasses of water per day);
- Drink hot beverages (e.g., warm tea with honey, except for infants under 1 year of age);
- Choose creamy foods;
- Humidify the room;
- Gargling with antiseptics/anesthetics/disinfectants;
- Avoid environments with smoke, alcohol, and caffeine.
And what about antibiotics—when can they be helpful?
At Correia Rosa Pharmacies, we offer screening tests for acute oropharyngeal infections, using a simple swab sample, and provide guidance after the results are available. → Learn more here.
Once we’ve determined the type of infection, we’ll help you relieve your symptoms.
Antibiotics: When They Make Sense
Most sore throats are caused by a virus and do not require antibiotics. If the presence of Group A Streptococcus is confirmed (or there is a strong clinical suspicion based on the rapid test result), a doctor’s visit is recommended, as an antibiotic appropriate for each person’s clinical condition will be necessary.
Clinical improvement is usually seen within 24–48 hours after starting the antibiotic.
Antibiotics started by the third day of illness shorten the duration of symptoms and reduce the likelihood of spreading the infection. To achieve this, it is essential to complete the full course of treatment.
With a coordinated approach to treatment, we focus on habits that speed up recovery and reduce transmission.
Practical Tips for a Better Recovery (and to Spread the Virus Less)
- Drink fluids throughout the day;
- Avoid very dry air and smoke;
- Do not share glasses or cutlery;
- Replace your toothbrush 24–48 hours after starting antibiotics (a best practice for preventing reinfection).
- Wash your hands and ventilate rooms to protect your family and coworkers.
FAQs
The test involves swabbing the throat. It may be uncomfortable, but it is quick (a matter of seconds).
You should avoid doing oral hygiene (such as brushing your teeth and using mouthwash) immediately before taking the test. In addition, you should also have fasted for around 4 hours before taking the test.
Generally speaking, these symptoms suggest a viral infection. At Correia Rosa Pharmacies, we screen for symptoms e aconselhamos o teste se for necessário.
In children, a culture may be required to confirm the diagnosis. In adults, the decision is a clinical one. If the symptoms worsen, it should be re-evaluated.
No. Antibiotics should only be used in situations where there is confirmation or a strong suspicion of a bacterial infection. Taking antibiotics unnecessarily increases bacterial resistance and the likelihood of suffering from their adverse effects.
Do you have a sore throat and want to know if it’s caused by a virus or bacteria?
Get tested for acute oropharyngeal infection at Correia Rosa Pharmacies and receive practical guidance on what to do to feel better.
