Costa Rica has found 11 new A/H1N1 flu cases, taking the total confirmed cases to 20, said Health Minister Maria Luisa Avila on Tuesday.

Tests were carried on 13 samples of possible cases and 11 of them were positive, Avila told Xinhua, adding that the results for the rest two cases would come out on Wednesday.

Avila said that among the confirmed cases there was a peasant from the Cartago province east of San Jose, who infected four members of his family, Avila said.

A girl from Heredia, some 15 km northeast of San Jose, also passed the virus to her brother, the minister added.

"We are investigating the transmission chain in these cases, because it seems they have not had contact with people from outside. But still we can not talk about an autochthonous transmission," Avila said.

The other confirmed cases were in people who had contact with the youth Chorus from Boston, the United States.

Costa Rica has confirmed 20 cases of human flu, including one death.

(Xinhua News Agency May 20, 2009)