Costa Rican Health Ministry reported on Friday that the number of high probable cases of influenza A/H1N1 raised to four people, and to the moment, the suspected cases in the country were eight.

From the possible cases, five were in San Jose province, two in Heredia province and one in Cartago, all of them in the center of the country.

Health authorities said that these cases must wait for the confirmation of the Costa Rican Institute of Nutrition and Health Investigation and Teaching, but in the mid time the patients have received antiviral treatment.

To the moment, Costa Rica has reported nine confirmed cases of human flu, among whom one person died.

The Health Ministry said that there have been analyzed 941 suspicious cases, 804 of whom were discarded, and 120 still wait for the results.

Costa Rica keeps the "sanitary national emergency" to assist the cases of human flu.