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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.

The binding of C3b by CR1 on macrophages leads to:

C3a can recruit phagocytes from the blood to the site of infection.