Oral presentation | Open | Published:
Toxoplasmosis: a rare cause of IRIS in HIV infected patients. Case series
BMC Infectious Diseasesvolume 13, Article number: O7 (2013)
Cerebral toxoplasmosis is one of the main 3 intracerebral opportunistic infections in HIV positive patients, along with cryptococcosis and tuberculosis. In comparison to these last 2 entities, toxoplasmosis does not provoke or very rarely provokes reconstitution syndromes.
We analyzed a case series of 3 patients with cerebral toxoplasmosis admitted in the Adults III Department of the National Institute for Infectious Diseases “Prof. Dr. Matei Balş” in 2012-2013.
Three patients, one male and 2 women, aged 55 years old, respectively 41 and 42 year-old, all 3 diagnosed concomitantly with HIV infection (as very late presenters) and cerebral toxoplasmosis, with a CD4 count of 6, 6 and 7/cmm respectively, viral loads (VL) of 254,000, 57,000 and 156,000 copies/mL respectively, and CSF viral load below the plasmatic VL in all 3 cases. We recorded minimal abnormalities of CSF analysis regarding the number of cells and biochemical exams; all had positive PCR for Toxoplasma gondii in the CSF and positive serology (IgG). All 3 had intracerebral lesions (abscesses) and all were biopsied at the neurosurgery department for diagnostic purpose before knowing their HIV-positive status. They received high doses of oral trimethoprim/sulfamethoxazole (T/S) for toxoplasmosis and antiretroviral therapy in the first 2 weeks after the diagnosis. They repeated cerebral imagery (MRI) after 3 weeks of T/S and had no regression of the size of lesions (although with the decreasing of perilesional edema) and new lesions, in two cases without having corresponding symptoms; in all 3 cases the CD4 count increased in the first month more than 100%. The search for another cause for the augmentation of their brain lesions was negative. Maintaining the same medication, the next imagery exams showed improvement in 2 out of 3 cases, in which the outcome was favorable with almost complete neurological recovery. In the remaining case the evolution was unfavorable (death).
In our 3 cases we presumed a paradoxical toxoplasmosis IRIS, with little or no clinical deterioration strictly linked with imagery exams depreciation in 2 out of 3 cases but with a fatal evolution in one case. Even rarely reported, the toxoplasmosis IRIS could be taken into account in some situations.