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The number of Covid 19 cases registered so far was already around 290 million worldwide at the turn of the year. But all statistics are likely to reflect only part of the pandemic. Indeed, 40 percent of those testing positive for Sars-CoV-2 have no symptoms. This is the result of a meta-analysis of international studies involving almost 30 million people. Conclusion: asymptomatic infected individuals contribute quite significantly to the spread of covid-19.
Qiuyue Ma and co-authors from the Department of Epidemiology and Biostatistics at Peking University recently published their findings in Jama Open, an online publication of the American Medical Association. “Asymptomatic infections are potential sources of covid-19 transmission, and the aim was to determine the percentage of asymptomatic infections among those tested and those with confirmed covid-19 disease,” the scientists wrote.
The experts reanalyzed 95 studies conducted and published worldwide, involving 29.8 million people. Around the globe, indeed, studies of the spread of SARS-CoV-2 have been conducted in virtually every country with even a reasonably functioning health care system since the onset of the Covid-19 pandemic.
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