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The invasion fluid, also known as a biological warfare agent, is a toxic substance produced by certain bacteria that can cause severe illness or death in humans and animals. One well-known example is the bacterium
Vibrio cholerae
, which produces cholera toxin, leading to severe diarrhea and dehydration. Another example is
Bacillus anthracis
, which produces anthrax toxin, causing symptoms ranging from mild skin irritation to life-threatening respiratory and gastrointestinal infections. These invasion fluids are typically spread through contaminated water, food, or direct contact with infected animals or their secretions, making them significant public health concerns.