Catalog · Physics of COVID-19 Transmission Lecture 26 of 49 Video 4-0: Safety Guideline for COVID-19—Chapter 4 Overview ← Previous Video 3-3: Epidemiological Models—Incubation-Enhanced Spreading Next → Video 4-1: Safety Guideline for COVID-19—Cumulative Exposure Time ✓ Mark complete Materials Transcript (PDF) ↗ transcript