sentence: This may be attributed to the delayed death phenomenon described by El-Zawawyet al. ( 2015 ) [ 21 ] who reported that tachyzoites remain viable for a while after using triclosan and they continue replication but are unable to successfully reinvade other host cells and die shortly.For additional evaluation of the effect of the used drugs on T. gondii tachyzoites , an ultrastructural study was performed .