Liquid biopsy startup Grail Inc., of Menlo Park, Calif., has reeled in $390 million in a series D financing that included new investors Public Sector Pension Investment Board and Canada Pension Plan Investment Board. Prior investor Illumina Inc., of San Diego, also participated in the round, as well as two unidentified backers.

As states in the U.S. move past the initial push for tests to identify active COVID-19 infections, antibody tests are ramping up quickly to aid in disease surveillance and return-to-work screenings. The rush has spurred an explosion in serology tests, many hastily developed and of questionable value. However, as the pandemic enters its third month, some companies are offering high-accuracy tests with validated results.

Wearables giant Fitbit Inc. has kicked off its first large-scale, virtual study to evaluate how well its wrist-worn technology can spot episodes of irregular heart rhythm that might indicate atrial fibrillation (AF). The study, part of a broader plan to equip Fitbit devices with new tools to speed the detection of a range of conditions, is open to people in the U.S. ages 22 and older who own a Fitbit that tracks heart rate.

Roche Holding AG, of Basel, Switzerland, has garnered U.S. FDA authorization for emergency use of a test to determine whether people have been infected with the novel coronavirus fueling the COVID-19 pandemic. The Swiss health care giant, which also makes molecular tests to detect active COVID-19 infection, claims its Elecsys Anti-SARS-CoV-2 antibody test accurately identifies COVID-19 antibodies in the blood 100% of the time, 14 days post-infection.

Reports of unusually high death rates for COVID-19 patients on ventilators have raised alarms, and some doctors are looking to reduce reliance on the breathing machines when possible. To advance that goal, Lungpacer Medical Inc., of Vancouver, British Columbia, has obtained an emergency use authorization (EUA) from the U.S. FDA for its Lungpacer diaphragmatic pacing therapy system (DPTS) for immediate use in ventilator patients at high risk of weaning failure, including patients with the novel coronavirus.

Pasadena, Calif.-based Circularity Healthcare LLC has initiated a clinical trial to evaluate its transdermal microcirculation device in COVID-19 patients with underlying health conditions. The aim is to see if use of the noninvasive deoxyhemoglobin vasodilator (from which the product derives its name) improves outcomes in patients suffering from coronavirus-related complications.

Pittsburgh-based Alung Technologies Inc. has received emergency use authorization from the U.S. FDA for its Hemolung Respiratory Assist System (RAS) to treat lung failure caused by COVID-19. The technology could help to ease demand for ventilators, which have been in short supply in coronavirus hot spots, and provide an alternative for patients who can’t tolerate mechanical ventilation.

Cytovale Inc., a San Francisco-based medical technology company, has snagged an additional $3.83 million in funding from the U.S. Department of Health and Human Services’ Biomedical Advanced Research and Development Authority (BARDA) to conduct a pilot study of its Rapid Sepsis Diagnostic System for patients with potential respiratory infections, including SARS-CoV-2, the novel coronavirus responsible for COVID-19. The patented technology, which can diagnose sepsis in less than 10 minutes, could speed up triaging and treatment of critically ill patients suspected of having the life-threatening condition.