Multiple choice

Swelling under udder is caused by ___________.

  1. virus

  2. bacteria

  3. fungus

  4. protozoa
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Swelling under the udder in cattle is mastitis, an inflammatory condition primarily caused by bacterial infections (Staphylococcus, Streptococcus, E. coli). While viruses can cause infections, udder swelling is most commonly bacterial in origin.

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