Sunny Hostin and Ana Navarro did not return to set, and neither of the co-hosts has released a statement on social media or via The View at the time of writing, so it’s not clear why the positive test results weren’t determined until after the live broadcast had already begun.
If contact could be limited as much as possible, hopefully nobody else on The View will test positive and Hostin and Navarro will recover as quickly as possible.
It may be a good thing that Hostin and Navarro were seated on the far side of the table from Joy Behar and Sara Haines, who presumably did not test positive.