ALEXANDRIA, Va., April 7 -- United States Patent no. 12,595,509, issued on April 7, was assigned to Karius Inc. (Redwood City, Calif.).

"Synthetic nucleic acid spike-ins" was invented by Fred C. Christians (Los Altos Hills, Calif.), Igor D. Vilfan (East Palo Alto, Calif.), Michael Kertesz (Menlo Park, Calif.), Timothy A. Blauwkamp (Palo Alto, Calif.), Shivkumar Venkatasubrahmanyam (San Jose, Calif.), Michael Rosen (Palo Alto, Calif.) and Rene Sit (Sunnyvale, Calif.).

According to the abstract* released by the U.S. Patent & Trademark Office: "This disclosure provides methods for determining relative abundance of one or more non-host species in a sample from a host. Also provided are methods involving addition of known concentrations of syn...