laura simmons from fox affiliate wztv in nashville has more. >> reporter: amy johnson knows more than she wants to know about swine flu. after her three kids all tested positive for h1n1, now she's sick. >> they said it was the a strain, the same cat grow as h1n1. >> it may come too late for her, but researchers at vanderbilt medical center have finally found a vaccine that works. >> we're very excite about the results. they're very robust. remember, these are early days, more results will come in. >> reporter: one thing doctors are excited about, initial results showed one inoculation protected over 90% of adult recipients, so there likely won't be a need for two shots, at least for now. >> that has put a smile on everyone's face because it means right away, everything will be so much easier for all the patients, who want to get protected, for all the providers, who are going to be delivering vaccines, and of course, it means we'll be able to protect more people completely much more quickly than had it taken two doses. >> reporter: this doctor can't wait to get his first allotment. >