lethal - sufficient to cause death; harmful or destructive, mutate - cause to undergo change in a gene; change it's form, commemorate - do something special in order to remember and honor an important event or person from the past, magnitude - the great size or extent of something, epidemic - the rapid spread of a disease so that many people have it at the same time, homophones - words that sound the same but have different meanings and spellings, potent - having great power, influence or effect, prohibition - order to restrain or stop, tumult - confusion or disorder, virulent - marked by a rapid, severe, and destructive course, armistice - an agreement during a war to lay down arms and stop fighting, censor - examine a book, movie, or newpaper articles officially and suppress or delete unacceptable parts of it, immunity - ability to resist disease, influenza - a contagious respiratory illness cause by influenza viruses, pandemic - an epidemic that affects people in a whole country or even throughout the world, parasite - a microorganism that lives on or in a host and gets its food from them, poliomyelitis - an infectious viral disease that affects the central nervous system and can cause temporary or permanent paralysis, Spanish flu - influenza caused by an influenza virus that created a pandemic beginning in 1918, vaccinate - treatment with a vaccine to produce immunity against a disease,

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