Answer:
antitoxin
Step-by-step explanation:
"Pathogens" are disease-causing bacteria, viruses or other microorganisms (fungi, parasites, and the like) that attacks the human body. They make the person sick by releasing microbial toxins.
There's actually a way to prevent such pathogens from causing serious illness to people and that is, with the help of antibodies like "antitoxins." This renders the toxins harmless by neutralizing them.
A specific type of antitoxin is made for a specific type of disease. For example, there's an antitoxin for measles and another antitoxin for flu.