Yes. Animals are responsible for spreading all sorts of diseases, such as rabies, intestinal parasites, leptospirosis and even the plague (which was spread by rodents).
Animals spread disease to humans by contact (saliva, feces, blood, or airborne) or through the things they produce (eggs, meats, etc). Animals also spread diseases among each other, like hoof and mouth disease and rabies. Sometimes, if one animal in a herd is infected, the whole herd must be destroyed to prevent the disease from spreading.
Animals can carry and spread diseases. One example is the fleas that were vectors for spreading the Black Death, also called the bubonic plague. Small rodents such as rats, squirrels, and mice can carry the infection. The fleas that live off these rodents can also feed on humans, which is how they spread the bubonic plague. A flea will bite an infected animal, such as a rat and then bite a person carrying the infection to them. There are about 1,000 to 3,000 cases of the bubonic plague worldwide each year.
Absolutely! Animals spread many diseases that humans contracted throughout history. Animals can even spread disease to each other and get similar diseases that humans contract.
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