title: [Oh, Christmas tree!].
authors.affiliation: Helsingin yliopisto, Tvärminnen eläintieteellinen asema 10900 Hanko.
authors.forename: M
authors.initials: M
authors.lastname: Brummer-Korvenkontio
mesh_terms: D028202:Abies / Q000821:virology*; D000818:Animals; D003411:Arvicolinae; D005192:Family Health; D006480:Hemorrhagic Fever with Renal Syndrome / Q000635:transmission* / Q000662:veterinary* / Q000821:virology; D006801:Humans; D029262:Puumala virus; D012376:Rodent Diseases / Q000635:transmission* / Q000821:virology; D013029:Space-Time Clustering