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

This transcript has been edited for clarity. 

I'm Dr Neil Skolnik, and today I'm going to talk about 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 their mouth fully, and absence of a sandpaper or scarlatiniform rash or strawberry tongue)

For patients with uncomplicated sore throat and low risk for rheumatic fever, the main goals are to reduce antibiotic use and provide symptomatic relief. For these patients, an assessment such as the Centor score can be done. Those with a low Centor score (0-2) can be treated with analgesics and there is no need for a POCT.

In patients with a higher Centor score, the consensus gives two choices: They can either be tested (and treated if the testing is positive), or it is reasonable to forgo testing and use a wait-and-see strategy, with reevaluation if they are getting worse after day 3 or not improving after day 5 days of their illness. Illnesses that last longer than 5 days with sore throat and fatigue should prompt consideration of alternative diagnoses, such as infectious mononucleosis. 

For patients with potentially complicated sore throat — including indicators such as worsening symptoms after 3 days or worsening after initiation of antibiotics, inability to open the mouth fully, unilateral neck pain or swelling, or rigors — should undergo a careful evaluation. The need for further testing in these patients, including labs and imaging, should be decided on a case-by-case basis. If the patient appears seriously ill, don't rely solely on POCT for GAS, but think about other diagnoses. 

Rheumatic fever. The approach is very different in patients at high risk for rheumatic fever. POCT for GAS is recommended irrespective of their clinical score, and antibiotics should be prescribed if it's positive for GAS. If a POCT is unavailable, then the consensus recommends prescribing antibiotics for all high-risk patients who have acute sore throat. 

This approach is sensible and puts a lot of emphasis on clinical evaluation, though it should be noted that this approach is considerably different from that in the 2012 Infectious Diseases Society of America guidelines. 

I'm interested in your thoughts, as well as how you approach this common problem. Please leave your thoughts in the comments section. 

I'm Dr Neil Skolnik, and this is Medscape.