The re-emergence of screwworm, thought to be eradicated, has struck fear into the United States' cattle industry. The New World screwworm fly is threatening the US$113 billion (NZ$194 billion) US cattle industry for the first time in more than half a century, as officials race to eradicate a deadly flesh-eating parasite not seen in Texas since 1966. The US Depar... [7120 chars]