Covid-19 confirmed cases have been rising steeply since the middle of last year, but the true extent of the first outbreaks in 2020 is unclear because testing was not then widely available.

Pakistan has vaccinated 2,857,746 people partially, while 1,286,429 individuals are fully vaccinated and total 5,358,808 doses of coronavirus jabs has been administered.
Country carried out 12,943,620 coronavirus tests over all after conducting 59,076 in a single day.
Covid-19 is continuing to spread around Pakistan, with 900,552 confirmed cases and 20,251 deaths across the country.
In the table below, cities are reordered by deaths, active cases, total confirmed cases and recoveries, in coloured bars.
Deaths have also been rising, however official figures may not fully reflect the true number in many cities.
Pakistan is presently experiencing the third wave of coronavirus which is said to be deadlier and more contagious than previous two waves.
According to National Command and Operations Center (NCOC), around 2,724 cases of coronavirus were reported while 65 people succumbed to the disease in the last 24 hours, taking the total death toll to 20,465.
The total number of confirmed cases reached 908,576.
As many as 827, 843 patients have recovered from the disease with 4,243 critical cases.
Several coronavirus vaccines have been approved for use, either by individual countries or groups of countries, such as the European Union and the World Health Organization (WHO).
Of the 189 countries and territories administering vaccines and publishing rollout data, 66 are high-income nations, 100 are middle-income and 23 low-income.
Most countries are prioritising the over-60s, health workers and people who are clinically vulnerable.
Some countries have secured more vaccine doses than their populations need, while other lower-income countries are relying on a global plan known as Covax, which is seeking to ensure everyone in the world has access to a vaccine.
With many countries now having started widespread vaccine rollouts, the number of daily cases is stable or falling in most regions.
However, Asia is the notable exception, mostly due to India's recent surge in cases.
Asia was the centre of the initial outbreak that spread from China in early 2020, but the number of cases and deaths were initially lower than in Europe and North America.
However, the recent surge in cases in India, Nepal and Japan is changing the picture.
India, which has the second-highest number of cases in total after the US, is currently seeing about 300,000 new confirmed cases every day.
The healthcare system is under extreme pressure, with hospitals at full capacity and daily reports of oxygen shortages.

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