8.L.1.1 & 8.L.1.2
The different is pandemic and epidemic is that an epidemic is when a sickness spread locally and great number have it. A pandemic is when the sickness is world wide when the sickness is spread global.
The virus will attack healthy cells by inserting its genetic material into its host and taking over the host functions. How can a virus be prevented is by vaccines and can be treated with antibiotics.