The Spanish Flu was one of the rarer ones that appeared to target only young healthy adults, but its believed that this was due to the Russian Flu weakening the

The Spanish Flu was one of the rarer ones that appeared to target only young healthy adults, but its believed that this was due to the Russian Flu weakening the immune systems of that generation first when they were children. https://www.realclearscience.com/articles/2017/11/13/why_did_so_many_young_people_die_from_the_spanish_flu_110453.html https://www.realclearscience.com/articles/2017/11/13/why_did...