Virtala A-M, Grohn YT, Mechor GD, Erb HN, Dubovi EJ. Association of seroconversion with isolation of agents in transtracheal wash fluids collected from pneumonic calves less than three months of age. Bov. pract. [Internet]. 2000 May 1 [cited 2024 Sep. 2];34(2):77-80. Available from: https://bovine-ojs-tamu.tdl.org/bovine/article/view/1627