Dead swans and Canada geese were found on a pond in a park that has since been closed due to avian flu concerns in Brockton and Avon, officials reported.

Avian flu is rampant in poultry farms and in wild birds in the U.S. Every mutation brings the virus one step closer to the brink of human-to-human transmission, but predicting whether a virus will cross that threshold remains an uncertain science.

There is no word yet as to when the park will reopen, as confirming a positive case of bird flu could take up to a week. To report any possible sick or dead birds, the public is a