Origin On 12 January 2020, the
World Health Organization (WHO) confirmed that a
novel coronavirus was the cause of a respiratory illness in a cluster of people in
Wuhan City,
Hubei, China, which was reported to the WHO on 31 December 2019. The
case fatality ratio for COVID-19 has been much lower than
SARS of 2003, but the
transmission has been significantly greater, with a significant total death toll. COVID-19 was confirmed to be present in the UK by the end of January 2020 with the first confirmed deaths in March 2020. Subsequent epidemiological analysis showed that over 1000 lineages of SARS-CoV-2 entered the UK in early 2020 from international travellers, mostly from
outbreaks elsewhere in Europe, leading to numerous
clusters that overwhelmed
contact tracing efforts. Limited
testing and
surveillance meant during the early weeks of the pandemic, case numbers were underestimated, obscuring the extent of the outbreak. A legally-enforced Stay at Home Order, or
lockdown, was introduced on 23 March, banning all non-essential travel and contact with other people, and shut schools, businesses, venues and gathering places. People were told to
keep apart in public. Those with symptoms, and their households, were told to
self-isolate, while those considered at highest risk were told to
shield. The health services worked to raise hospital capacity and established
temporary critical care hospitals, but initially faced some
shortages of personal protective equipment. By mid-April it was reported that restrictions had "
flattened the curve" of the epidemic and the UK had passed its peak after 26,000 deaths. The UK's overall death toll and by population surpassed
that of Italy on 3 May, making the UK the worst affected country in
Europe at the time. Restrictions were steadily eased across the UK in late spring and early summer that year. The UK's epidemic in early 2020 was at the time one of the largest worldwide. By the autumn, COVID-19 cases were again rising. This led to the introduction of
social distancing measures and some localised restrictions. Larger lockdowns took place in all of Wales, England and Northern Ireland later that season. In both England and Scotland,
tiered restrictions were introduced in October, and England went into a
month-long lockdown during November followed by
new tiered restrictions in December. Multi-week 'circuit-breaker' lockdowns were imposed
in Wales and
Northern Ireland. A
new variant of the virus is thought to have originated in
Kent around September 2020. Once restrictions were lifted, the novel variant rapidly spread across the UK. Its increased transmissibility contributed to a continued increase in daily infections that surpassed previous records. The healthcare system had come under severe strain by late December. Following a partial easing of restrictions for Christmas, all of the UK went into
a third lockdown. The second wave peaked in mid-January with over 1,000 daily deaths, before declining into the summer. The first COVID-19 vaccine was approved and began being
deployed across the UK in early December, with a staggered rollout prioritising the most vulnerable and then moving to progressively younger age groups. The UK was the first country to do so, and in early 2021 its vaccination program was one of the fastest in the world. Quarantine rules for all incoming travellers were introduced for the first time in late January. Restrictions began to ease from late February onwards and almost all had ended in Great Britain by August.
Third wave A third wave of daily infections began in July 2021 due to the arrival and rapid spread of the highly transmissible
SARS-CoV-2 Delta variant. However, mass vaccination continued to keep deaths and hospitalisations at much lower levels than in previous waves. Infection rates remained high and hospitalisations and deaths rose into the autumn. In December, the
SARS-CoV-2 Omicron variant was confirmed to have arrived and begun spreading widely in the community, particularly in
London, driving a further increase in cases that surpassed previous records, although the true number of infections was thought to be higher. It became mandatory for people to show
proof of full vaccination or proof that they are not infected to enter certain indoor hospitality and entertainment venues. On 9 January 2022, the UK became the seventh country worldwide to pass 150,000 reported COVID-19 deaths. All remaining legally enforced COVID-19 related restrictions concluded in Northern Ireland and England during February 2022, with that step being taken in Scotland (partially extended into April) and Wales by the end of March. Cases rose following the relaxation of restrictions but began to fall shortly after. The
UK Health Security Agency publishes a weekly "national influenza and coronavirus (COVID-19) report", which summarises COVID-19 levels and other seasonal respiratory illnesses. == Responses ==