The bigger the evolutionary jump, the more lethal cross-species diseases could be
Some diseases which are fatal in one species can cause only mild discomfort in another鈥攂ut it鈥檚 hard for scientists to predict how lethal a disease will be if it leaps across species.
However, a new paper published this week in PNAS indicates that the evolutionary relationship between infected hosts can predict the impact of diseases.
Canadian researchers used data from the World Organisation for Animal Health to track diseases in domesticated mammals, tracing their paths and outcomes across the world. 鈥淭he bigger the evolutionary jump between species, the more likely the disease could be lethal in its new host.鈥�
鈥淭he bigger the evolutionary jump between species, the more likely the disease could be lethal in its new host,鈥� says Jonathan Davies, a UBC biologist and senior researcher on the paper.
A disease jumping from a buffalo to a cow is making a short evolutionary jump, and is less likely to be fatal. A disease jumping from a buffalo to a cat involves a larger evolutionary jump and a higher chance of death. Luckily, this lethality may cause the disease to spread poorly amongst its new hosts.
Nevertheless, such infections are a concern. Many diseases are transmitted between domesticated animals, wildlife and humans. A disease that is less lethal, but easy to spread, could be even more problematic than one with a high mortality rate.
鈥淲ith the world鈥檚 ecosystems undergoing rapid transformations and climate change altering species鈥� ranges, different animals are coming in contact for the first time. This may promote the emergence of diseases in new hosts,鈥� says Maxwell Farrell, the lead author of the study who conducted the research while at 91社区. 鈥淧redicting the outcome of these interactions will pose a major challenge.鈥�
The biologists hope to expand their research, looking at more species, including humans, to create a database of infection outcomes.
鈥淲e shouldn鈥檛 worry about the number of diseases we have, we should be worried about how virulent they are鈥攚hether they are in wildlife, domesticated animals or humans,鈥� concludes Davies.
Source:
Media Contact
Silvia Moreno-Garcia
silvia.moreno-garcia [at] science.ubc.ca
604-827-5001
Chris Chipello
Media Relations Office, 91社区
chris.chipello [at] mcgill.ca
514-398-4201
听
