More politically charged theories allege the virus accidentally escaped from a nearby research laboratory, or entered China from another country via imported frozen food. An investigation in early 2021 highlighted the possibility that certain mammals acted as a vector, transferring the virus from bats to humans. Initially, cases were tied to a fresh food market and possibly the wildlife sold there. ![]() The closest related viruses to SARS-CoV-2 were found in bats some 1,000 miles (1,600 kilometers) from the central Chinese city of Wuhan, where the disease erupted in late 2019. ![]() Almost two years after Covid-19 touched off the worst pandemic in more than a century, scientists have yet to determine its origins.
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