Covid in Scotland: How much longer will lockdown last?

2 月 3, 2021World News

The first minister has confirmed that Scotland will be in full lockdown until “at least” the end of February.

Nicola Sturgeon said the current restrictions were working, but added the level of Covid infections clearly remained “too high”.

How much progress does Scotland need to make before lockdown can begin to be eased?

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Measuring the epidemic

Scotland’s national clinical director, Prof Jason Leitch, has talked about using World Health Organisation (WHO) indicators when calculating the level of Covid-19 transmission in the country.

He told BBC Scotland this week that the Scottish government was aiming to get the number of cases below 50 per 100,000 people and the percentage of people testing positive under 5% before it would consider relaxing restrictions.

Doing both of these things would put Scotland in the WHO’s “level 2” category of community transmission, where it’s judged there is a “moderate incidence” of locally acquired infections.

The WHO’s seven categories range from “no active cases” to “level 4” community transmission, when the general population is at high risk of being infected.

In the organisation’s guidance on implementing measures to control Covid-19, the WHO also lists two other ways of calculating the levels of Covid in a population: hospital admissions and death rates.

Governments using this guidance will balance these indicators against the other health harms and economic impacts caused by lockdown measures.

It’s also likely the Scottish government would want to see rates remain below the WHO thresholds for sustained periods, rather than briefly dipping below the line.

1. The number of cases per 100,000 people is much too high

The WHO advises governments to look at their weekly confirmed cases per 100,000 people and then average the figure out over a 14-day period.

By this measure, Scotland had a rate of 165 cases per 100,000 people on 2 February.

There’s been a sustained decline in this figure since the middle of January, but the rate is still well above the WHO’s level 2 threshold of 50.

Case rates

The last time Scotland was below 50 cases per 100,000 was at the beginning of October.

It’s difficult to compare this rate with the first outbreak in the spring as there was no mass testing earlier in the pandemic.

2. The percentage of positive tests also needs to come down

The Scottish government measures the positivity rate by dividing the number of positive tests per day by the total number of tests carried out.

The figure it’s aiming for is 5%, which again would put Scotland in the WHO’s “level 2” of community transmission.

Like infection rates, the number is declining, but there’s still some way to go.

Positivity rate

3. The death rate has not begun to decline yet

The WHO says governments should look at the number of weekly deaths “attributed” to Covid-19 per 100,000 people and average them out over 14 days.

A death rate of two per 100,000 people or less needs to be achieved to indicate “level 2” community transmission, according to the WHO.

This chart counts deaths in Scotland within 28 days of a positive test for Covid-19. If the wider definition of all death certificates mentioning the virus were used, the rate would be slightly higher.

The rate in Scotland is currently just over seven and has not yet begun to decline.

Death rate

The full lockdown in the spring ended on 28 May, although the easing of restrictions was phased over several weeks during the summer.

4. Will hospital admissions begin to decline soon?

Figures on Covid-19 hospital admissions are currently available up to 22 January, when the 14-day average of weekly admissions was 22.

The WHO threshold in this instance is 10 cases per 100,000.

The 14-day average has not yet begun to decline significantly, but daily admissions appear to have peaked on 11 January, according to Public Health Scotland figures.

Hospital admissions

In the spring, the decline in infection rates was followed by a decline in hospital admissions and finally a fall death rates.

If this pattern is repeated, then a corner may have been turned in this second wave – but there is still a long way to go before the rates of infections, hospital admissions and deaths are where the Scottish government would like them to be.





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