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Thick blood may also be caused by the presence of harmful pathogens such as fungi, viruses, bacteria, and parasites. These pathogens can actually activate a coagulation response in the body as a way to avoid being attacked by the bodyâs immune system.
These defects may also affect the bodyâs ability to clean up the fibrin deposits formed as a result of the clotting process.1. Thick blood may also be caused by the presence of harmful pathogens such as fungi, viruses, bacteria, and parasites.