John Snow studied how diseases spread in populations of people.  Today we call this 

What is the term used to describe a population where the unvaccinated are less likely to be exposed to a pathogen because the majority of the population is immune?

Which Ig group is most likely to be found in the mucous of the intestines?

Macrophages receptors recognize ________ while B-cell receptors recognize ___________.

All Lymphocytes are born in bone marrow.  B-cells mature in _______ and T-cells mature in _______.

Which of the following is NOT an Agranulocyte?

Type 1 allergies are triggered by an overexpression of

An elevated basophil count would most likely indicate

True / False mRNA vaccines CAN NOT cause an infection.

Vaccines are intended to stimulate memory cell formation and provide long-term immunity.  This would classify them as a type of