You can now read a portion of Chapter 1 of Immunity Index at the Tor/Forge blog. It will be published on May 4: https://www.torforgeblog.com/2021/02/26/excerpt-immunity-index-by-sue-burke/

It’s not a sequel to Semiosis and Interference (the sequel, Usurpation, is on the way). Instead, this is the story of separated sisters, a virus, a rebellion — and a cantankerous woolly mammoth.