Why might repeated infections lead to a referral to an immunologist?

Repeated infections may lead to an immunologist referral when they are frequent, severe, unusual or deep seated. These patterns can raise the possibility of an immune problem, especially when they occur with allergic disease, poor growth or autoimmune conditions, though they do not establish a diagnosis by themselves.

The pattern can matter more than one infection

Infections such as sinusitis and bronchitis are common, and a primary immune deficiency is not usually considered the cause of most of them. Still, Kettelhut, an immunologist interviewed on the IG Living Advocate Podcast, says needing antibiotics two, three or four times a year, or having unusual infections such as pneumonia or deep seated infections, can raise the question of whether the body is having trouble fighting infection. This is a reason to consider the pattern, not a cutoff that establishes an immune disorder. (I1892, I1893)

The type and severity of infections also matter. The Allergy & Asthma Network says people with primary immunodeficiency diseases may take years of trial and error before reaching an immunologist who recognizes an underlying condition beyond common illnesses. It also reports that early diagnosis and treatment can slow disease progression and prevent damaging infections. (I807)

Sinus and lung infections may lead to a referral

Ear, nose and throat physicians and pulmonary physicians are among the specialists Kettelhut identifies as likely to refer someone for an immune evaluation. ENT physicians see sinusitis, while pulmonary physicians see recurrent pneumonia and bronchitis. Those specialists may encounter a repeating pattern through the organ system they treat. (I1894)

Allergy and immunology specialists are also involved in evaluating inborn errors of immunity. Rubin, speaking on The Allergist podcast, describes allergist immunologists as the experts in this area. A referral can help connect repeated infections with other medical findings and consider whether an immune evaluation may be useful. (I751)

Other health findings can add context

Repeated infections are not the only pattern that can prompt evaluation. Biggs says allergic disease combined with severe or unusual infections, poor growth, immune cytopenias or multiple autoimmune conditions can be features that prompt evaluation for primary atopic disorders. (I756)

Kettelhut notes that many people with common variable immunodeficiency have both poor antibody responses and abnormal antibody responses, and cites autoimmune cytopenias such as thrombocytopenia and neutropenia. Separately, authors writing in Frontiers in Immunology say that an underlying inborn error of immunity may be overlooked when clinicians focus on autoimmune conditions, which can delay genetic diagnosis. (I1896, I456)

Evaluation and treatment decisions depend on the person

A referral does not mean that a person will need a particular treatment. In a discussion of testing for specific antibody deficiency, Prince says testing should be considered in light of whether an intervention would benefit the patient. He gives prophylactic antibiotics and immunoglobulin replacement therapy as examples of interventions that may be considered. (I746)

Prince also says immunoglobulin replacement, given intravenously or under the skin, is reserved for people who have had multiple severe bacterial infections or very bad infections. For many secondary immune deficiencies, Jeimy says there is no single cutoff for starting replacement therapy. The decision involves collaboration among the patient, immunology and other specialties. (I745, I786)

For people with primary immunodeficiency, the Allergy & Asthma Network describes care that often starts with preventing infections and treating them promptly and aggressively. Treatment and evaluation depend on the individual, so health decisions belong in a discussion with the person's own doctor. (I832)

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