%0 Journal Article %A FLORI, P. %A HAFID, J. %A BOURLET, T. %A RABERIN, H. %A GENIN, C. %A TRAN MANH SUNG, R. %T Experimental model of congenital toxoplasmosis in guinea-pigs: use of quantitative and qualitative PCR for the study of maternofetal transmission %D 2002 %J Journal of Medical Microbiology, %V 51 %N 10 %P 871-878 %@ 1473-5644 %R https://doi.org/10.1099/0022-1317-51-10-871 %I Microbiology Society, %X Maternofetal transmission of Toxoplasma gondii was assessed in pregnant guinea-pigs, with a gestational period of 65 ± 5 days. A total of 56 female guinea pigs was infected by the intraperitoneal route (RH strain), by the oral or the intraperitoneal route (Prugniaud strain; PRU) or by the oral route (76K strain). Inoculation was performed 90 ± 18 days or 30 ± 9 days before the onset of gestation or 20 ± 6 days or 40 ± 6 days after. Gestational age was determined by a progesterone assay. Parasite loads (fetal brain and liver) were assessed by nested PCR and real-time PCR quantification on Light Cycler ® was performed with a SYBR Green I ® technique. The 76K strain appeared to be the most virulent in the model: the neonatal survival rate was 31%, in contrast to 53% and 68% for the PRU and RH strains, respectively. The percentage of survival of neonates for all strains taken together was lower after inoculation at 40 days’ gestation (25%) than at 20 days’ gestation (77%). Whatever the strain, maternofetal transmission determination was greater with nested PCR (54% for RH, 84% for PRU and 86% for 76K strains) than with real-time quantitative PCR (31% for RH, 66% for PRU and 76% for 76K strains). However, real-time quantitative PCR showed that neonatal parasite load was greater with the cystogenic strains (76K, PRU) and that high hepatic load (>10 000 parasites/g) was often associated with disease severity (11 of 12 cases). Therefore, this technique may provide an important element in understanding this congenital disease. %U https://www.microbiologyresearch.org/content/journal/jmm/10.1099/0022-1317-51-10-871