| Viral: | Cytomegalovirus—congenital and acquired (including cases of AIDS)—see alsoChapter 21 Rubella—congenital |
| Protozoa: | Toxoplasma gondii |
| Helminths: | Toxocara canis and catis A granuloma due to Toxocara can be associated with a peripheral eosinophilia. This condition should not be mistaken for malignant retinoblastoma, which may give a similar ophthalmoscopic appearance, otherwise an eye may be unnecessarily enucleated (seep. 562) |
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