A method and composition for treating a host infected with flavivirus or pestivirus comprising administering an effective flavivirus or pestivirus treatment amount of a described 1\u2032, 2\u2032 or 3\u2032-modified nucleoside or a pharmaceutically acceptable salt or prodrug thereof, is provided. The method and system creates andor updates lock objects to relate to multiple locks, i. The person to be identified that is to photograph their iris uses this iris input device in the following manner. The transistor structure includes a drain zone of a first conductivity type. The method includes the steps of: providing a breath treatment unit that is configured to be hand-holdable by a user; through the hand-holdable breath treatment unit, directing into the user’s mouth a quantity of a breath treating substance; and discharging the breath treating substance through the hand-holdable breath treatment unit. Exhaled air is used to flush the space around the diaphragm.