Most definitely. The Black Plaque AKA Bubonic plaque killed like 1/3 of the human population. It's reason for spreading...fleas. Then through trade, war, and rats, they would get carried.
Bubonic plague and Cat Scratch disease can be carried by fleas.
Possibly, they can carry various diseases
Fleas can transmit heart worm, tapeworm, etc. to your animals. Fleas are tiny, but they sure can pass things on to your animal that you wouldn't want. The best thing you can do is always keep up on the flea treatment and preventatives.
Fleas don't carry chlamydia.
Yes, fleas can infest raccoons.
It depends on the parasite and if they carry a diseases. Mosquitoes can carry malaria, yellow fever, Zika all which have high death rates, especially malaria. Fleas can carry the plague (black death) which killed hundreds of thousands.
Anything that has fleas, can give fleas to guinea pigs.
It probably means having fleas.
The rats were infected with fleas. The fleas were infected with diseases that were transmitted to people by thr bite of the flea.
No, bees don't carry fleas. They have their own pests, such as the varroa mite, but these are not interested in humans or other animals.
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Yes, the possums live in my attic and fleas fall from the vents and cracks because of them.