Which of the following immune system cells can be found in the tissue but not in circulation?

A physical barrier that a pathogen would need to breach in order to gain entry into the body would be:

Opportunistic pathogens can cause disease when:

Which of the following is true about commensal species?

Which of the following pairs are the two anaphylatoxins we talked about in class?

Effector B-cells are _______ and effector T-cells are _______.

A defense that a pathogen would need to breach (get past) to gain entry into the body could include:

Which of the following is/are anaphylatoxins?

Which of the following is true about the origins of vaccination?

Which of the following is false about antigens?