This vet is suffering from Q fever, which commonly presents with fever, elecated liver enzymes, throbocytopenia and lung infiltrates. The gram stain and culture appear to be negative because coxiella is an intracellular bacteria. He is at high risk for this infection from the inhalation of the bacteria during farm animal delivery.
Q fever Coxiella burnetii, no arthropod vector. Spores
inhaled as aerosols from cattle/sheep amniotic
fluid. Presents with headache, cough,
influenza-like symptoms, pneumonia, possibly
in combination with hepatitis. Common cause
of culture ⊝ endocarditis.
Q fever is caused by a Quite Complicated
Bug because it has no rash or vector and its
causative organism can survive outside in its
endospore form. Not in the Rickettsia genus,
but closely related.