Covid-19 at the same time.While neither of the two patients infected with multiple strains had suffered the most severe symptoms of the virus, there are concerns that further new strains of Covid could arise as a result of this unusual type of double-infection.The researchers, based at Feevale University’s Molecular Microbiology Laboratory, had studied the genetic samples from over 90 Covid-19 patients across the country's southern state, Rio Grande do Sul.Fernando Spilki, the lead researcher on the study, said that the cases of multiple infection had worrying implications.“These co-infections can generate combinations and generate new variants even more quickly than has been happening,” he said . “It would be another evolutionary pathway.