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FOUNDATION OVERVIEW

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People with healthy immune systems can be exposed to certain viruses, bacteria, or parasites and have no reaction to them; however, people living with Human Immunodeficiency Virus (HIV) can face serious health threats from opportunistic infections (OIs). These infections are called opportunistic because they take advantage of a weakened immune system. Opportunistic pathogens are encountered at CD4 levels below certain thresholds (Figure 28-1). Besides causing morbidity and mortality, opportunistic infections accelerate the progression of HIV disease. For this reason, guidelines emphasize concurrent antiretroviral therapy (ART) with prophylaxis, treatment, and secondary prophylaxis of opportunistic infections.

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FIGURE 28-1

History of opportunistic infections associated with human immunodeficiency virus. Reproduced with permission from Anderson PL, Kakuda TN, Fletcher CV. Human Immunodeficiency Virus Infection. In: DiPiro JT, Talbert RL, Yee GC, Matzke GR, Wells BG, Posey L, eds. Pharmacotherapy: A Pathophysiologic Approach. 9th ed. New York, NY: McGraw-Hill; 2014:chap. 103.

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MUCOCUTANEOUS CANDIDIASIS

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Mucocutaneous candidiasis is a fungal infection caused by Candida species (most commonly Candida albicans). Candidiasis presents as thrush (a creamy, white plaque-like lesion on the tongue or buccal surface). The most common location for thrush is the oropharynx and esophagus. Esophageal candidiasis may present as retrosternal pain or dysphagia. The diagnosis of thrush is a clinical diagnosis based on the appearance of plaques. A culture may be needed to identify the Candida species. The lesions are painless and can be scraped off with a tongue depressor.

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Prophylaxis

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Primary prophylaxis is not routinely recommended for Candidiasis. Routinely administering prophylaxis would increase drug interactions with ART and promote drug-resistant species. Secondary prophylaxis is recommended for patients with severe recurrences (fluconazole 100-200 mg/day).

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Treatment

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Topical treatment may be used for the initial episode of oropharyngeal candidiasis. Topical agents include clotrimazole troches or nystatin suspension. Systemic treatment options include oral fluconazole for 7 to 14 days. Itraconazole and posaconazole are alternatives for oropharyngeal candidiasis. Systemic therapy is recommended for esophageal candidiasis (fluconazole 200-400 mg/d for 14-21 days). Treatment failure may occur in patients with previous azole exposure. Alternative treatment options include itraconazole, voriconazole, caspofungin, micafungin, anidulafungin, and amphotericin B (Table 28-1).

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TABLE 28-1Drug Treatment for Candidiasis

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