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The pathogens responsible for pneumonia in cattle are similar to the pathogens that cause pneumonia in all mammals: viruses and bacteria are most common, with fungi causing relatively few cases.

Cattle have a particular type of pneumonia called shipping fever that is a well-known problem in the industry. Calves are generally weaned from their mothers at about 6 months of age, castrated if male, vaccinated and then sent to a feedlot where they are provided a mixture of grain and hay rather than the grass and milk they had been eating. These changes cause a lot of stress, and the calves are mixed with calves from many differet farms which exposes them to disease their immune systems have not encountered before. Because of all this, it is common for calves just entering a feed lot to have an outbreak of pneumonia.

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Q: What causes pneumonia in cattle?
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