How bad is the H7N9 bird flu? We give you the scary answers

What changes are scientists seeing in the virus and why is this important?

A: Although it is not yet clear, the virus appears to have mutated in a way that would make it easier for it to adapt and grow at normal body temperature in mammals. Scientists are working to figure out which species could now be playing host to the virus, and one possibility is pigs.

Is there a vaccine?

A: No vaccine exists, but the World Health Organisation and its partners are already working to isolate and identify possible candidate viruses that could be used to make a future vaccine if necessary. However, it would likely take months to produce the first doses.
[link to www.dailytelegraph.com.au]