Parasitic worms that infect humans are not interbreeding with those that infect cattle as previously thought. This is good ...

After a decades-long campaign to beat the parasites down to Panama, they’re speeding back up north.

Fish were caught by local fishermen in the coast of the State of Rio de Janeiro (21-23°S, 42-45°W), Brazil. Hosts were mostly fresh, but some specimens were kept frozen at –20°C, until examination.