WHO: Flu Virus Still Poses Risk through Mutation Through Mutation. Impact of any pandemic would range from mild illness in countries with strong health programs to devastating sickness in nations with weak health systems, shortages of drugs and poorly equipped hospitals. 10 percent of those infected with H1N1 in Mexico and the U.S. needed to be admitted to hospitals, a rate much higher than for seasonal flu. WHO will issue new guidance recommending that Tamiflu and other antiviral drugs be used only for vulnerable patients.”]
Source: https://www.bankinfosecurity.com/who-flu-virus-still-poses-risk-through-mutation-a-1460