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Sulfonamide Allergy and Alternative Treatments in Ocular Toxoplasmosis
Francisco Calleja Casado1, Antonio Duch Samper1,2
1Ophthalmology Service, Hospital Clínico Universitario de Valencia, Valencia, Spain.
Purpose:
To summarize current knowledge on the clinical features, diagnosis, and treatment of ocular toxoplasmosis, with emphasis on alternatives for sulfonamide-allergic patients.
Materials And Methods:
A comprehensive PubMed search (1908-2021) was conducted using terms like Toxoplasma gondii, ocular toxoplasmosis, posterior uveitis, and retinochoroiditis. Priority was given to studies published after 2000, particularly those from 2010 onwards. Google Scholar, as well as English and Spanish sources, were also utilized.
Results:
Ocular toxoplasmosis is the most common infectious form of posterior uveitis worldwide, typically presenting as necrotizing retinochoroiditis with associated vitreomacular adhesion and vitritis. Diagnosis is mainly clinical, supported by serology (IgG/IgM) and PCR of intraocular fluids when needed. Standard treatment includes systemic antiparasitic agents (e.g., pyrimethamine with sulfadiazine or trimethoprim-sulfamethoxazole) plus corticosteroids. In patients with sulfonamide allergies, alternatives such as pyrimethamine with clindamycin or azithromycin, or intravitreal clindamycin with dexamethasone, are effective. Recent studies show comparable outcomes with these regimens. Prompt treatment of active disease helps reduce retinal damage.
Discussion:
Recent evidence supports the efficacy and safety of non-sulfonamide regimens and intravitreal therapies in managing ocular toxoplasmosis. These options are particularly valuable for patients with contraindications to standard treatments. Advances in imaging and molecular diagnostics have also enhanced early recognition and tailored management of the disease, contributing to improved visual outcomes.
Conclusion:
Advances in diagnostic tools (PCR, intraocular antibody detection) and alternative therapies have improved outcomes in ocular toxoplasmosis, including in patients who are intolerant to sulfonamides. Clindamycin-based or intravitreal approaches offer effective, safe options. Further research is needed to refine treatment protocols, prevent recurrences, and clarify disease pathogenesis.
Insights
Ocular toxoplasmosis, a common cause of posterior uveitis, is treatable with alternatives like clindamycin for sulfonamide-allergic patients. Prompt diagnosis and treatment improve visual outcomes.
Area of Science:
- Ophthalmology
- Infectious Diseases
- Parasitology
Background:
- Ocular toxoplasmosis is the leading infectious cause of posterior uveitis globally.
- It typically manifests as necrotizing retinochoroiditis, often with vitreomacular adhesion and vitritis.
Purpose of the Study:
- To review current knowledge on ocular toxoplasmosis.
- Emphasis is placed on diagnostic methods and treatment strategies, especially for patients allergic to sulfonamides.
Main Methods:
- A comprehensive literature search was performed using PubMed and Google Scholar.
- Studies published between 1908 and 2021 were reviewed, with a focus on recent publications (post-2010).
Main Results:
- Diagnosis is primarily clinical, supported by serology and PCR.
- Standard treatment involves antiparasitic agents and corticosteroids.
- Alternative regimens (e.g., clindamycin-based) and intravitreal therapies are effective for sulfonamide-allergic patients.
Conclusions:
- Non-sulfonamide and intravitreal treatments are effective and safe alternatives.
- Advancements in diagnostics and therapies improve early detection and management.
- Further research is needed to optimize treatment and understand pathogenesis.
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