A farmer comes to the ER complaining of shortness of breath,…

A farmer comes to the ER complaining of shortness of breath, cough, and chest pain. You notice a black eschar on his forearm. An X-ray shows the development of bilateral pneumonia. A history of the patient shows that some of his cattle died of unknown reasons a few days ago. A gram stain of the sputum shows the presence of Gram+ve, endospore forming rods. The most likely diagnosis is: