A cluster of four Covid-19 cases detected after two guests from India attended an open-air wedding near Houston, Texas, has underlined the capacity of the Delta coronavirus variant to cause infections in recipients of multiple vaccines.
Genome sequencing of viruses from the six patients — all vaccinated — suggests the Delta variant may be able to evade immune responses in patients who have received the Pfizer or Moderna vaccines or India’s Covaxin, researchers at the Baylor College of Medicine, Houston, said.
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Joseph Petrosino, director of molecular virology, and his colleagues probed six Covid-19 cases in April that occurred soon after a wedding gathering in a large, open-air tent with 92 attendees, for which the guests required to be fully vaccinated.