When you have reports of some infectious disease coming in, there are broadly two ways to order them: by registration date (when the report was received), and by occurrence date (when the diagnosis/test was actually taken). Both registration date and occurrence date counts have the capacity to mislead, they just do it in different ways.
Do we have sequencing or contact tracing data to link the London outbreak(s) with the West Midlands outbreak? (There is a possibility that London outbreak(s) got seeded independently by travel to counties with their own significant outbreaks.)
Do we have sequencing or contact tracing data to link the London outbreak(s) with the West Midlands outbreak? (There is a possibility that London outbreak(s) got seeded independently by travel to counties with their own significant outbreaks.)