Borrelia afzelii is infectious.
Borrelia afzelii is a species of Borrelia a bacterium that can infect various species of vertebrates and invertebrates . Among 30 Borrelia known species , it is one of four which are likely to infect humans causing a variant of Lyme disease . In parasitology , coinfection [ ˌkoʊɪnˈfɛkʃən ] is the simultaneous infection of a host by multiple pathogen species .