Studies show that one gram of placenta from an infected sheep can contain over one billion Q fever microbes.
These microbes become airborne in tiny droplets of mists or aerosols and spread to workers:
when animals give birth,
during processing of infected tissues from slaughtered animals,
at milking or during the processing of milk, or
during animal surgery.
After giving birth, animals usually eat their placenta and other tissues of afterbirth. When this happens, the Q fever microbes survive digestion. They pass along the animal's intestine and become discharged with the manure. This allows Q fever to spread widely throughout the environment.
The Q fever microbe easily becomes airborne with dust from infected animal tissues, manure, or soil. As a result, workers can become exposed to Q fever by contacting various infected materials such as
dust from animals, bedding, or manure,
soil near animal pens,
animal hides, wool, and furs, and
clothes from workers who were exposed to infected animals or materials.
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