For a long time, cherished humans intended to create a vaccine, or a drug that could handle all of the current influenza viruses.
Dutch scientists have just created a variant of the avian influenza virus with a strong virulence, which could cause millions to die at the same time.
The flu epidemic this year in the US can be very serious since the pandemic of swine flu - influenza A (H1N1) in 2009, according to US health officials.
Just last week the number of reported cases of H3N2 in Japan skyrocketed by 620,000 patients, to 1.73 million. Most of them are students and the elderly.