herd immunity

Concept

Indirect protection from infectious disease when a sufficient percentage of a population is immune

9 stories

Measles Outbreak Spreads in Michigan County

First Measles Case Confirmed in DeKalb County

Parent Division Over Vaccines Deepens as Measles Risk Grows

Colorado Measles Outbreak Grows to 10 Cases as Broomfield Spread Continues

Colorado Sports Bar Linked to Expanding Measles Outbreak

Pandemic Experts Warn Measles Resurgence Signals Future Disease Threats

Washington County Works to Contain Potentially Deadly Virus Outbreak

Measles Outbreak Risks Over 100 California Children

US Vaccine Skepticism Appears in Health Statistics