You might see a priest hold his thumbs and forefingers together after touching the host during the Offertory and Consecration in order to protect and preserve even the smallest particles of our Lord Jesus Christ in the Eucharist. He will touch nothing else [other than the Eucharist] until these fingers can be rinsed during the cleansing of the Sacred Vessels. This was stipulated in the Rubrics of the Traditional Latin Mass. It is no longer mandatory in the Novus Ordo but many priests recognize how appropriate and correct it is to have this reverence for the Body, Blood, Soul and Divinity of Jesus Christ and how this reverence can spread to their flocks. All priests should consider picking up this beautiful and appropriate habit.