A child who refuses to eat for two days, a fever that rises sharply, and small white vesicles at the back of the throat: one often thinks of a classic sore throat, but the picture points towards a herpetic sore throat. This infection of the pharynx and tonsils, caused by the herpes simplex virus (HSV), is distinguished from bacterial sore throats by its characteristic lesions and the complete lack of effectiveness of antibiotics.
Herpetic sore throat and strep test: why the rapid diagnostic test is useless here
In practice, the reflex in the face of a sore throat with fever remains the rapid diagnostic test (RDT) to look for group A streptococcus. In the field, this action becomes counterproductive when the signs clearly indicate a viral origin.
The updated recommendations in 2024 emphasize this point: a presentation with oral vesicles and ulcerations immediately excludes the RDT-antibiotics pathway. The presence of cough, runny nose, or ulcerated lesions in the mouth indicates a virus, not a bacterium. Testing anyway exposes to a false positive (asymptomatic carriage of streptococcus) that triggers unwarranted antibiotic treatment.
In practice, when grouped vesicles are observed on the tonsils or soft palate, accompanied by a sudden fever, it is better to direct towards symptomatic management. To better understand the treatment of herpetic sore throat, one must first accept that the herpes simplex virus follows its own healing timeline.
Herpes simplex virus and tonsils: the mechanism of infection
Herpetic sore throat results from an infection by the herpes simplex virus, most often type 1 (HSV-1). The virus enters through direct contact with the saliva or secretions of an infected person, even outside of a visible outbreak. The primary herpetic infection primarily affects children between 1 and 5 years old, a period when the immune system encounters the virus for the first time.
Once established, HSV infects the epithelial cells of the pharynx and tonsils. An intense inflammatory reaction is then observed: the throat becomes very red, clear fluid-filled vesicles appear, and then rupture to form small painful ulcerations. These lesions resemble canker sores but their distribution on the tonsils and palate distinguishes them.
Do not confuse herpetic sore throat with herpangina
Confusion is common, even among some practitioners. Herpangina is caused by enteroviruses (coxsackievirus), not by the herpes virus. Its vesicles are concentrated on the posterior palate and tonsillar pillars. Herpetic sore throat affects the tonsils themselves with more extensive ulcerations. The distinction is not trivial: it conditions the follow-up and precautions against recurrence.
Unlike the enteroviruses of herpangina, HSV persists in the nerve ganglia after the primary infection. Reactivations are possible, triggered by fatigue, stress, or a decrease in immunity.
Symptoms of herpetic sore throat: recognizing warning signs
The onset is often abrupt. The child (or adult, more rarely) presents with a high fever, intense sore throat, and marked difficulty swallowing. Unusual irritability may sometimes be noted in very young children who cannot verbalize the pain.
Signs to look for in the mouth:
- White or yellowish vesicles on the tonsils, soft palate, and sometimes the tongue, which rupture within a few hours to leave superficial ulcerations
- Diffuse redness of the pharynx, more pronounced than in a common viral sore throat
- Swollen and tender cervical lymph nodes, a sign of local immune response
- Excessive salivation in young children, related to pain when swallowing
The fever can last three to five days, while the ulcerations generally take about a week to heal completely. Dehydration is particularly monitored in children who refuse to drink due to pain.
Symptomatic treatment of herpetic sore throat: what really works
Since no antibiotic acts on a virus, management focuses on relieving symptoms. The doctor usually prescribes an age-appropriate pain reliever (paracetamol as the first choice) to control fever and pain.
Pain management and diet
Pain when swallowing is the main daily issue. Cold or lukewarm soft-textured foods are preferred: applesauce, yogurt, cooled soups. Acidic, spicy, or crunchy foods worsen the ulcerations and prolong discomfort.
To maintain hydration, small amounts of fresh water are offered at regular intervals rather than large amounts spaced out. Feedback varies on the usefulness of antiseptic mouthwashes in children: their tolerance depends on age and patient cooperation.
Antivirals: in which cases the doctor considers them
Antivirals like acyclovir are not routine in simple herpetic sore throat. Their prescription is more justified in immunocompromised patients, in cases of severe forms, or frequent recurrences. For the majority of cases, spontaneous healing occurs in less than ten days without antiviral treatment.
A medical consultation remains necessary to rule out a secondary bacterial superinfection. It is required if the fever persists beyond five days or if the child shows signs of dehydration.
Contagion and prevention: limiting the transmission of the herpes virus
Herpetic sore throat is contagious from the onset of the first symptoms and as long as the vesicles are active. Transmission occurs through direct contact with saliva, nasal secretions, or lesions. In young children in group settings, sharing utensils or toys brought to the mouth is the main vector.
Concrete measures to limit the spread:
- Wash hands after each contact with the sick child, especially after blowing the nose or oral care
- Assign individual utensils and a glass for the duration of the symptoms
- Avoid kisses on the mouth and sharing food until the ulcerations have healed
The herpes virus persists in the body after recovery. The primary infection provides some immunity, but reactivations remain possible throughout life, usually in less severe forms than the initial episode. Monitoring triggering factors (stress, fatigue, intense sun exposure) helps anticipate these recurrences.