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Commensal organisms have been present in humans bodies for a very long time and we have learned to live with them and even depend on them.

An intracellular pathogen:

Which two regulatory proteins work together to cleave C3b into iC3b in order to avoid the formation of the C3 convertase?

The classical complement cascade can only be activated after antibodies bind to a pathogen.

Mature T and B cells can travel through

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?