The most widespread type of flu this season has become resistant to the widely used antiviral drug Tamiflu, but there is no need to get worry, government health officials announced.

Especially this season flu cases are far lower than the previous year, and other antiviral drugs are working well against this particular flu virus and health officials are attentive to the current situation.

The cause of the mutation, which has made this virus resistance to that particular drug is still unknown, experts though, it occurred by the extensive use of Tamiflu in most of the country to treat RTIs (Respiratory Tract infections).

Last year, certain types of flu H1N1 viruses were get resistant to oseltamivir. Cases were reported from Europe and other countries.

This year, the U.S. Centers for Disease Control and Prevention was bewared for flu resistance to Tamiflu in the U.S and were expecting the resistance of virus to Tamiflu. Furthermore, the ratio of the resistant strain has grown up to 10 percent than the previous year to all of the H1N1 strains this year.

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