Commentary

Acute Sore Throat in Primary Care: When to Reach for the Antibiotics


 

This transcript has been edited for clarity.

There is a helpful consensus from experts on the best management of patients with acute sore throat. This is a common problem in primary care, and one for which there is a lot of evidence, opinion, and ultimately overprescribing of antibiotics. This consensus presents a pragmatic clinical approach aimed at decreasing overprescribing, yet detecting which patients are likely to benefit from treatment with antibiotics.

Let’s first go over the evidence that forms the basis for the recommendations, then the recommended approach. First, a sore throat can be caused by many different viruses, as well as group A streptococcus (GAS), the group C streptococcus S dysgalactiae, and fusobacterium. We sometimes think of throat cultures as telling us the definitive etiology of a sore throat. In fact, children commonly are colonized with GAS even when not infected — 35% of the time, when GAS is detected on throat swab in a child, GAS is not the cause of the sore throat. Very few adults are colonized with GAS.

Sore throats are usually self-limited, whether they are treated with antibiotics or not, but occasionally complications can occur. Suppurative complications include peritonsillar abscess, sinusitis and sepsis. Nonsuppurative complications are primarily glomerulonephritis and rheumatic fever, which can lead to rheumatic heart disease.

Antibiotics. Antibiotics have three potential benefits in acute sore throat: to reduce the risk of developing rheumatic heart disease, reduce the duration and severity of symptoms, and treat suppurative complications. The risk for rheumatic heart disease has almost vanished in high-income countries, but not in low-income countries. Thus, antibiotic treatment of acute sore throat due to GAS may benefit those in living in, and those who recently emigrated from, low-income countries.

Patients with suppurative complications should be identified because antibiotics are important for this group. Although antibiotics are prescribed primarily to prevent rheumatic fever in this population, they may be mildly helpful in reducing a patient’s symptoms.

Testing. The sensitivity and specificity of high-quality point-of-care tests (POCTs) are on par with those of cultures, with the advantage that the results are available within minutes. Negative tests reduce unneeded antibiotic prescriptions.

Given this evidence, the authors recommend an approach that puts a lot of emphasis on two major things: the risk for rheumatic fever, and clinical assessment. On the basis of these factors, a decision is made about the utility of POCTs and treatment with antibiotics for GAS. The risk for rheumatic fever is based on epidemiology: If the patient is in a low-income country or has recently immigrated from one, then the risk is high, and if not, the risk is low.

Complicated vs uncomplicated? This is determined by clinical assessment of the severity of the patient’s illness, including general appearance. Uncomplicated sore throat means that the patient:

  • Is not getting worse after 3 days of illness
  • Has a duration of illness ≤ 5 days or is getting better after day 5
  • Has mild to moderate symptom severity (bilateral throat pain, the ability to open the mouth fully, and absence of a sandpaper or scarlatiniform rash or strawberry tongue)

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