It shouldn't really surprise us: parasites are becoming increasingly resistant to the drugs we use. Parasites simply follow Darwin's law: survival of the fittest. In fact, all biological organisms have this ability to adapt to the environment through evolution. As a result, bacteria are now increasingly resistant to antibiotics, malaria parasites are widely resistant to antimalarials, and insects are now vastly resistant to a number of insecticides. Parasites are no different, and we should all learn the lesson from history.

For 40 years we've treated parasites very intensely, and the results are clear: horses are still exposed to the same species as 40 years ago, and the only major difference is that our drugs are losing their effect. This is worrisome since it remains unknown whether or not new drugs will be introduced to the market, and, if so, when