Scientists on the WHO-sponsored mission visited the Wuhan lab as well as the wet market that were widely speculated to be the origin points of Covid-19.
The 76-day lockdown in Wuhan was imposed on 23 January 2020, two days before the Chinese New Year. While it tackled the virus spread, the approach received criticism too.
In a statement, US Department of State says researchers from China's Wuhan Institute of Virology fell sick much before first Covid case was officially recorded in December in the city.
The two, who are part of an expert team deputed to trace the origins of the novel coronavirus, tested positive in Singapore. China said the remaining 13 members will undergo quarantine in Wuhan.
The much-delayed visit is also taking place when China, which has effectively contained the virus, is experiencing a relapse of the disease in several places in Hebei province.
The probe comes almost a year since China locked down Wuhan as an outbreak of pneumonia that started with food market workers in late 2019 spread throughout the city.
The seroprevalence study was conducted by researchers from different establishments — including Lanzhou University and Wuhan University — from March to May 2020.
According to a serological survey, about 4.4% of those tested were found to have specific antibodies that can fight off Covid, indicating they were infected some time in the past.
As many as 21 policy reforms are under implementation following Invest Kerala Global Summit, as LDF govt works to change perception that the state is not conducive to businesses.
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