With no explanation, label text_A→text_B with either "not_related" or "related".
text_A: Borrelia afzelli is among 30 known species of Borrelia.
text_B: Borrelia afzelii is a species of Borrelia a bacterium that can infect various species of vertebrates and invertebrates .. Borrelia. Borrelia. bacterium. bacterium. invertebrates. invertebrates. Among 30 Borrelia known species , it is one of four which are likely to infect humans causing a variant of Lyme disease .. Lyme disease. Lyme disease. Borrelia. Borrelia. Coinfection by this Borrelia species with one or more pathogens can occur , carried by the vector , which appears to be in most cases the tick .. Borrelia. Borrelia. Coinfection. Coinfection. vector. vector ( epidemiology ). tick. tick
related.