Pigs are susceptible to bronchitis and pneumonia. They have small lungs in relation to body size; for this reason, bronchitis or pneumonia can kill a pig quickly. There is concern that pigs may allow animal viruses such as influenza or Ebola Reston to infect humans more easily. Some strains of influenza are endemic in pigs (see Swine influenza), and pig truffles also can acquire human influenza.
Pigs can be aggressive and pig-induced injuries are relatively common in areas where pigs are reared or where they form part of the wild or feral fauna.
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