Arctic melting may help parasites infect new hosts
Grey seals are encountering a killer microbe as they move north
![](https://i0.wp.com/www.sciencenews.org/wp-content/uploads/2014/02/ts_S_pinnipediCyst.jpg?fit=860%2C460&ssl=1)
NEW NEIGHBORS As the Arctic emerges from a deep freeze, parasites including Sarcocystis pinnipedi (shown, purple) are able to infect animals that they have never encountered before.
M. Grigg