However, the conceptual differences between viruses and bacteria as different entities was not fully understood for some time, complicating preventative measures taken during the 1918 influenza pandemic. That doesn't sound quite like the flu we know.  Since these mild symptoms can make diagnosis in the field difficult, tracking the spread of avian influenza requires laboratory testing of samples from infected birds. The more moderate effect on total deaths was attributed to the measures being employed too late, or lifted too early, most after six weeks or less.  Alcohol is an effective sanitizer against influenza viruses, while quaternary ammonium compounds can be used with alcohol so that the sanitizing effect lasts for longer.  However, outbreaks in pigs are common and do not cause severe mortality. Army. The resulting rapid change in viral genetics produces antigenic shifts, which are sudden changes from one antigen to another.  A number of rapid tests are available; however, people may still have the infection even if the results are negative. The only other animals known to be susceptible to influenza B infection are seals and ferrets. 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