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An organism that can cause disease when the host immune defenses are weak or when it establishes somewhere in the body it is not commonly found is called:

Whenever antibodies are involved, which complement pathway is the last to be activated?

Edward Jenner created the first vaccine against a disease. He used the cowpox virus to create a vaccine that would provide protection against the smallpox virus.

Which of the following is true about initial protease activity in the complement pathways?

Once a pathogen gets into a body, the innate immune system kicks in, causing which of the following?

What is the initial protease in the Classical pathway?

Antibody functions include:

Many of the complement components are made by the _______ cells, and can be found in ___________.

Mature lymphocytes encounter pathogens in:

The adaptive immune response of the immune system is known to be fixed but specific, while the innate immune response is said to be flexible.