ABSTRACT
Objective To explore the feasibility of the nested PCR technique to detect the Trichosporon asahii DNA in the blood and liver samples from the murine model of disseminated trichosporonosis.Methods On day 3,7,14 after intravenous inoculation of Trichosporon asahii suspension,blood and liver samples of 30 BALB/c mice were collected.Another ten normal mice serve as control.DNA was amplified by nested PCR,with a pair of primer.Fungal culture was done as control.Results On day 3,7,14 after inoculation,the positive rate of the serum fungal cultivation were 0,20%,0;the positive rate of the serum after nested PCR assay was 80%,90%, 88.9%;the positive rate of liver fungal cultivation were 50%,40%,22.2%;the positive rate of liver after nested PCR assay was 90%,90%,88.9%.There were statistical differences between the positive rate by nested PCR assay and fungal cultivation to check the serum and liver samples on day 3,7,14 after inoculation.The survival mice to the 14~(th) day were too less to make statistical analysis.Conclusion The results suggest that T.asahii DNA assay by nested PCR is more specific,more sensitive,and faster than fungal cultivation.The nested PCR assay could be a potential assay for the diagnosis of disseminated trichosporonosis.
ABSTRACT
A case of a two year and three month old Thai boy with a history of recurrent bacterial infections since aged 2 months. A definite absence of superoxide activity in the patient' s granulocytes detected by nitroblue tetrazolium test indicated the diagnosis of chronic granulomatous disease. He suffered from septicemia and systemic fungal infection, resulting in death despite rigorous medical care. The postmortem findings showed extensive granulomatous inflammation in several internal organs. Tissue culture led to diagnosis of disseminated Trichosporonosis, an uncommon infection in immunocompromised patients. This is the first case report of disseminated trichosporonosis in a chronic granulomatous disease patient.