Parents in Oregon who have received notices on the need to get their children required vaccinations for attending school have one more week to get it done. Exclusion letters went out last month. Trish Elliott at the Hood River County Health Department says one vaccine seems to be the one that most who received the letters are lacking: the adolescent tetanus, diphtheria, and pertussis booster. Elliott noted the number of letters sent out in Hood River County overall dropped from nearly 200 last year to 138.