4-9 809/5101= 16% new cases/current cases, India. https://www.worldometers.info/coronavirus/country/india/
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4-8 The most closely related coronavirus is in a Chinese horseshoe bat, the researchers found. But the new virus has gained some unique mutations since splitting off from that bat virus decades ago.
Dr. Boni (of Penn State U.) said that ancestral virus probably gave rise to a number of strains that infected horseshoe bats, and perhaps sometimes other animals.
“Very likely there’s a vast unsampled diversity,” he said.
Copying mistakes aren’t the only way for new viruses to arise. Sometimes two kinds of coronaviruses will infect the same cell. Their genetic material gets mixed up in new viruses.
It’s entirely possible, Dr. Boni said, in the past 10 or 20 years, a hybrid virus arose in some horseshoe bat that was well-suited to infect humans, too. Later, that virus somehow managed to cross the species barrier. “Once in a while one of these viruses wins the lottery,” he said. https://www.nytimes.com/2020/04/08/science/new-york-coronavirus-cases-europe-genomes.html
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