Writing on the BMJ’s blogging website, Devi Sridhar and Adriel Chen look at how Scotland is on course to eliminating the virus.
In April 2020, the Scottish government issued a framework for decision-making on covid-19 which notably included that there would be no acceptable number of covid-19 cases, and that no one would be intentionally exposed to this virus. This framework set the objective clearly: to drive the number of cases as close to zero as possible, and from that, a strategy and game plan could be worked out to arrive at the outcome.
For the past two weeks in June, Scotland has consistently had a decreasing number of cases, hospitalizations, and deaths from covid-19, leading to a continued push for a “Zero covid” Scotland (See Figures 1-3). In addition, the positivity rate—the number of people testing positive out of the total number of people tested—has fallen to under 0.5% most days. As Scotland has a land border with England, and is part of a global world, this does not mean elimination with no cases ever. It does, however, mean working towards ending community transmission and local cases, and moving towards a future where the main risk of covid-19 is from imported cases. These need to be quickly identified, traced, and all individuals quarantined. An elimination strategy is optimal for public health, the economy, and society, as it allows maximum normality as lockdown eases, and avoids the halfway house that results from a high level of virus transmission and circulation.
Scotland used the time in lockdown, which began on 23 March 2020, to build up a “test, trace, isolate, support” system, referred to as “Test and Protect.” This helped effectively suppress the virus. Lockdown measures have been eased cautiously and in a step-wise fashion. This strategy involves testing symptomatic individuals, tracing contacts, isolating those who are carrying or have been exposed to the virus, and providing them with necessary support to meet their needs. Early on, Health Protection Scotland decided not to rely on an app for contact tracing, but to build up existing capacity within NHS public health boards.
Scotland also took a more cautious route out of lockdown, using phases that usually started 2-3 weeks after the rest of the UK. When the message in England switched to “Stay Alert” on 10th May, Scotland continued with the “Stay at Home” message. Even until 3rd July, households are encouraged not to travel more than 5 miles from their home for leisure and relaxation. Households are also encouraged to meet and interact with others outdoors, which was in line with increasing evidence on the lower risk of transmission outdoors compared to indoors. Clear messaging seems to be an important component of adherence to rules, given that the majority of people want to follow public health guidance, but need to have clear instructions on what is and is not permissible.
A third component in Scotland’s approach is a high degree of trust in government and in the leadership of the First Minister Nicola Sturgeon to manage covid-19 effectively, as a recent Edinburgh University study noted. In late March, the Scottish Government established its own scientific advisory group to coordinate with the Scientific Advisory Group for Emergencies (SAGE) and provide advice tailored to Scotland’s needs. From its inception, transparency was encouraged and the Scottish Government website published the membership of the group, as well as minutes and eventually background papers. Sturgeon and other key senior officials held daily briefings outlining the state of the pandemic in Scotland, as well as taking questions from members of the press, leading to intense scrutiny and debate on the measures being taken.
While Scotland is heading towards a possible “Zero covid” future, major challenges lie ahead. Firstly, “Test and Protect” must be strengthened to ensure it is catching all cases in the country and does not become overwhelmed, especially when heading into the winter months when many of the symptoms from colds, respiratory infections, and influenza can overlap. Winter encourages indoor interaction and brings more people into indoor settings. Early evidence indicates that virus transmission is more effective indoors than the outdoors.
Secondly, given the global pandemic has yet to peak, there is an ongoing risk of cases being imported into Scotland from the rest of the world. Increasing vigilance would require land borders, marine ports, and airports to be monitored.
Finally, citizens around the world will start to fatigue from ever-changing public health measures and messaging. This runs the risk of decreasing compliance over time and a reciprocal increase in new infections and local transmission. Therefore there remains a small window of time to push infections to a negligible level, establish robust and real-time monitoring, re-open schools full-time, lift shielding for the vulnerable and reintroduce socializing, and get the economy up and running again. Scotland has taken a slow and steady path, but one that will hopefully lead to a more sustainable future.