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An epidemic is an outbreak of a disease that spreads quickly and affects a large number of people within a community, region, or population at the same time, in contrast to a pandemic, which is a global outbreak of a disease. An epidemic often involves illnesses that were previously controlled or uncommon in the area. The spread can happen through person-to-person contact, contaminated food or water, or other methods. Public health measures, such as vaccination, quarantine, and hygiene practices, are typically used to control and prevent further spread of the disease.

A pandemic is a global outbreak of a disease that affects a large number of people across multiple countries or continents. Unlike an epidemic, which is limited to a specific area, a pandemic has a much broader geographic impact and can lead to widespread illness and disruption. Examples include the COVID-19 pandemic and the 1918 influenza pandemic. Controlling a pandemic typically involves working together across countries, widespread public health measures, vaccination campaigns, and efforts to reduce the spread of the disease through quarantine and hygiene practices.

A collision is an incident where two or more vehicles crash into each other, causing damage to the cars and possibly injury to the people inside. Collisions can happen for various reasons, such as speeding, distracted driving, or slippery road conditions. The severity of the collision can range from minor damage to more serious accidents that result in major harm. After a collision, police usually respond to the scene to investigate, and insurance companies typically manage the claims related to repairs or medical costs.