On October 21, 2006, the effusion of a reddish substance was noted from a consecrated Host during the Eucharistic Celebration at Tixtla, in the Diocese of Chilpancingo-Chilapa. The Bishop of the place, Most Reverend Alejo Zavala Castro, then convened a Theological Commission of investigation and, in October 2009, he invited Doctor Ricardo Castañón Gómez, to take on the leadership of the program of scientific research whose purpose was in fact that of verifying the said event.
The Mexican Ecclesiastical authorities turned to Doctor Castañón Gómez because they were aware that, in the years 1999-2006, the scientist had conducted some studies on two consecrated Hosts that also bled in the Parish of Saint Mary, in Buenos Aires. The Mexican case starts in October 2006, when Father Leopoldo Roque, pastor of the Parish of Saint Martin of Tours, invites Father Raymundo Reyna Esteban to lead a spiritual retreat for his parishioners. As Father Leopoldo and another priest were distributing Communion, assisted by a religious sister who was to the left of Father Raymundo, this latter one turns towards him with the “pix” containing the Sacred Particles, looking at Father with eyes filled with tears, an incident that immediately attracted the attention of the celebrant: the Host that she had taken to give Communion to a lady parishioner had begun to effuse a reddish substance.