Page 13 - Oct12020

The Midwest Cattleman · October 1, 2020 · P13
Herd Immunity an Important Concept for Humans, Animals

By Ellen Crawford, NDSU Extension Service
The term “herd immunity” portance of individual immu-
has come into common usage nity is the practice of vacci-
in recent months. nating horses to protect them
“This is an important term against the disease caused by
and is a concept that is crit- West Nile virus. The West Nile
ical to understand as it per- virus is transmitted to horses
tains to human and animal through the mosquito. This
health,” says Gerald Stokka, virus cycles between mosqui-
North Dakota State Univer- toes and bird populations,
sity Extension veterinarian with horses and humans be-
and livestock stewardship coming infected when bitten
specialist.
The concept of herd immu- continued on page 19
nity is a companion concept to
individual immunity.
“Individual immunity is
important to us all as im-
munity is critical to our very
survival,” Stokka says. “We
are constantly exposed to
potential disease-causing or-
ganisms, and yet the vast
majority of people are as-
ymptomatic (show no obvious
signs or symptoms of disease)
or have only mild symptoms
for a short period of time.”
A good example of the im-

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