Which tick causes diseases in humans?

• A. American Dog Tick
• B. Deer Tick
• C. Lone Star Tick
• D. Gulf Coast Tick

Answer: (A)

Ticks can pass disease-causing pathogens to humans during feeding. The American Dog Tick is a well-known vector for Rocky Mountain spotted fever, which is caused by the bacterium Rickettsia rickettsii. When this tick bites a person, it can transmit that bacterium, leading to symptoms such as fever, headache, and a characteristic rash. Because RMSF is a classic human disease linked to this species, the American Dog Tick is often cited as a tick that causes disease in humans.

Other ticks on the list can also transmit illnesses—deer ticks transmit Lyme disease and other pathogens, Lone Star ticks can carry ehrlichiosis and other conditions, and Gulf Coast ticks can transmit Rickettsia parkeri rickettsiosis. Still, the American Dog Tick is a widely recognized example of a tick that causes human disease, which is why it’s identified as the correct option.