Passive immunity lasts only as long as the antibodies survive in body fluids.
Factors in body fluid health potassium and sodium are crucial to the body's fluid balance.
Passive immunity lasts only as long as the antibodies survive in something containing potassium and sodium.
Passive immunity lasts when the antibodies survive in something containing what?

A) fever
B) Leptospirosis
C) resistance
D) Chlorophyll
E) potassium
F) disease
G) bacteria
H) parasites