Lyme disease is an illness spread through the bite of a blacklegged tick—also known as a deer tick—that is infected with the Borrelia burgdorferi bacteria. Not all ticks are infected with the bacteria, so not all tick bites spread Lyme disease. Lyme disease does not spread from person to person.
Diseases can spread to people through mosquito or tick bites, or contact with animals. Therefore, it’s important to know how to avoid these diseases.