SAMN07710591 Novel Helicobacter species MIT 17-337 SRS3626837 Microbe sample from Helicobacter didelphidarum Helicobacter didelphidarum MIT Anthony Mannion Microbe, viral or environmental Microbe.1.0 MIT 17-337 Didelphis virginiana feces 2017 USA tissue sample type strain of Helicobacter didelphidarum 412376