researchers with the national institute of infectious diseases tested four drugs, including tamiflu and relenza. they say they have confirmed that all of the drugs are effective in containing the virus. ministry officials say the state and municipalities have enough anti-viral drugs for more than 63 million people, covering nearly half of the population of japan. >>> u.s. secretary of state john kerry has discussed the crisis on the korean peninsula with china's leaders. kerry is hoping china will use its influence to ease rising tensions following a series of provocations by north korea. kerry met chinese president xi jinping on saturday afternoon. >> translator: your visit will help maintain the momentum of development in the relationship between our two countries. >> i hope this can be even a further definition of the model relationship which you have often talked about. >> kerry told the president the world is going through a critical time with some very challenging issues in iran, syria, and the middle east. he said the chal ledges include the problems on the korean peninsula. kerry also m