A Japanese teenage girl is suspected of the first person-to-person transmission of a Tamiflu-resistant strain of the H1N1 flu virus in that country, according to reports.

Health officials in Sapporo, northern Japan detected the resistant strain in the teenager who developed a fever in late August. After administrating the antiviral drug Relenza, the girl recovered. There were no signs of an unusual rise in H1N1, nor did the virus appear worse in the area.

Japan has now experienced 8 Tamiflu-resistant cases of the H1N1 virus.