As an antibacterial drug, doxycycline works by interfering with the normal growth cycle of the invading germs. This prevents the bacteria from reproducing, allowing the normal defenses of the body to fight off the infection. This process is called bacteriostatic action. Inasmuch as the action of doxycycline depends on its concentration within the invading organisms, it is necessary that the patient completely follow the physician's directions.
The gram-negative bacterium called brucella is the known cause of a true zoonotic disease, which is appropriately named brucellosis. The disease usually has an acute beginning, with fever lasting for several days. However, there are no signs that point to any particular part of the body. This early stage is followed by a chronic stage with repeated recurrence of symptoms, including vague pains, weakness, and fever. This is the reason why brucellosis is also sometimes called undulant fever.
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