Responses to last week’s “Name that condition” photo show this one was relatively easy for our expert veterinarian readers.

Dr. Bob Glock, from the Arizona Diagnostics lab supplied the photo, He says this picture, of the lung of a feedlot steer, shows the effects of interstitial pneumonia.

Several readers offered less-specific diagnoses, such as BRD or pneumonia. Some others were more specific, identifying the condition as AIP (atypical interstitial pneumonia) or interstitial pneumonia with emphysema or BRSV infection.

Several readers suggested BRSV as a causative agent, which is understandable. According to a fact sheet from the Beef Cattle Institute (BCI) at Kansas State University, AIP and Bovine Respiratory Syncytial Virus (BRSV) have the same gross lesions. “It was once thought that BRSV was the cause of AIP, but that has been ruled out,” the authors note. “BRSV can cause respiratory death but it is a different mode of action that AIP.”

Several others identified the condition as Acute Bovine Pulmonary Edema and Emphysema (ABPEE) or fog fever, essentially a type of interstitial pneumonia occurring in pasture cattle, typically after moving to lush pastrues.

Correct responses included those from Shmuel Bruckstein, Melissa Bravo, Paul D. Motter, Victor Monterrosa, Cody Creelman, Martin Alejo de Antón and Jacob Boyes.

Also according to the BCI fact sheet, we know the following about interstitial pneumonia in feedlot cattle:

  • The highest incidence rate is in July and August.
  • It occurs four times more in heifers than in steers.
  • Most cattle will have been on feed at least 90 days.
  • It is associated with a high rumen pH (> 6.0).
  • There is no treatment for AIP.