Update #2 - Contact Tracing

Update #2 - Contact Tracing Protoype

Changes include:

• Virus will now start at a random day between day 1 and day 7 instead of just always on day 1, provides more uncertainty about scale of the spread when first case is detected
• A prototype version of contact tracing has been added. Currently it has a set capacity of 100 case interviews per day (in future this will be able to be upgraded)
• Slightly increased effectiveness of lockdown as previously lockdown needed to be combined with masks to be effective and it wasn't powerful enough to slow the spread on its own
• Backend change: positive cases and isolating cases are now treated separately as through contact tracing, cases can be in isolation before they test positive
• Increased threshold for recovery so cases do not recover after 7 days if they are still severely ill (but aren't severely ill enough to require further treatment)
• Changed testing behavior so that now the driving force behind making people more likely to get tested is if they are a close contact (previously it was driven by if there were just known cases in the community)
• The smoothed 6-day implementation of restrictions has been fixed to work properly
• Changed case chart to show whether the source of a case was known or unknown (currently this is just determined by if they were isolating as a close contact when they tested positive)