Which of the following is a possible scenario for the pathogen Borrelia burgdorferi?
a. it can become introduced into the skin after a person is bitten by a mouse vector
b. it is very host specific and even geographically specific, with most cases occurring in the northeastern part of the country
c. it causes a very distinct disease that is easily diagnosed, but not many people with the pathogen actually go in to a clinic for a diagnosis
d. it can be passed to more than one person during the lifetime of the vector