DGX ▲ +0.0% - Quest Diagnostics Incorporated $DGX - Nearly 1 in 3 Patients with Suspected Lyme Disease are Co-Positive for Other Tick-Borne Pathogens, Finds Study by Quest Diagnostics Quest Diagnostics released study findings showing that nearly one in three patients with suspected Lyme disease test positive for co-infections with other tick-borne pathogens, highlighting the prevalence of multiple simultaneous infections from tick exposure. The research underscores demand for comprehensive tick-borne disease testing, which could support the diagnostic testing services that form a core part of Quest's business, though the market showed no net reaction to the announcement today. 21-SEP-2026 08:03 AM ET