Official websites use .gov
A
.gov website belongs to an official
government organization in the United States.
Secure .gov websites use HTTPS
A lock (
) or https:// means you've safely
connected to the .gov website. Share sensitive
information only on official, secure websites.
Simplified representation of contact graph layer: blue circles represent graph nodes (modelled individuals), green squares represent different structure and size households, red squares represent places for possible social contacts, and black lines represent graph edges—possible contact routes, i.e., possible infection vectors.
