Implement Virus Prototype

[luvies]

This is the top issue for designing the Virus model prototype. We will work off our current interface proposal and refer most top-level design choices to the customer information document provided on the VLE.

Major points:

• People are simulated in aggregate
• Countries should be handled as single simulation units
  • Internally, we can simulate this however we need
• Movement between countries should also be simulated

[luvies]

@GPIG-T2/prototype-virus is the team working on this model