Viral Shift
A
viral shift
is the widespread emergence of a seemingly novel virus. It is a prerequisite viral condition for
pandemics
. An existing virus undergoes a change and becomes a
pathogen
, such as the constantly mutating "A" strain of
influenza
in which the change is known as an
antigenic shift
.
Vaccines
or natural
antibodies
can not produce an
immune response
to the new strain.
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