Some of the facts about a pathogen, P, are that:
1 it is transmitted in food and water
2 it lives in human intestines
3 it has many genes coding for surface proteins
4 it changes its surface antigens
5 it may or may not trigger an immune response.
Which explains why it is difficult to develop an effective vaccine for P?
P can mutate to produce different antigens.
2 )
P is a eukaryotic cell with many genes.
3 )
P is found in contaminated food and water and affects the gut.
4 )
People can be infected with P and may not show symptoms.
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