Discuss the recent measles outbreak in King County, focusing on its implications for public health and the importance of vaccination. Explore how the emergence of the fifth case highlights gaps in immunization, particularly among infants. Analyze the public health response and preventive measures taken to contain the outbreak. Provide historical context on the effectiveness of vaccines, drawing parallels to past successes in controlling infectious diseases. Conclude with recommendations for increasing community awareness and encouraging vaccination to prevent future outbreaks.