NR511 Final Exam Study Guide 2 See Midterm and Week 1 Study Guide for content covering weeks 1, 2 & 3 Common Infections 1. Impetigo Impetigo is a superficial bacterial infection of the skin. It is classified into primary impetigo when there is a direct bacterial invasion of previously normal skin or secondary impetigo when the infection arises at sites of minor skin trauma. The occurrence of secondary impetigo is referred to as impetiginization. Impetigo is most frequently observed i...