Key points from article :
Shionogi claims its influenza virus treatment is faster-acting than any other flu drug.
One dose of baloxavir marboxil effectively kills the virus within a single day.
Overall time to alleviate symptoms was similar to other anti-virals.
But faster relief might curb the virus's contagiousness.
Oral drug works by preventing cells' susceptibility to virus infection.
Phase 3 clinical trial completed in 2017.
Expecting approval in Japan this year, and US next year.
