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Briefly,
the swine flu is common in pigs; there are outbreaks every fall and
winter-so much so that many farmers vaccinate their pigs against the
current swine flu viruses-at present there are four strains in pigs.
It most recently became contracted to humans through some sort of
close contact between a farmer and his pigs. This said, it is
causing an outbreak in humans in Mexico and the United States.
Secondly,
you may be wondering why-if it is a flu-it is so catastrophic an
event-this passing between human and pig. There are a couple of
reasons. The first reason is that swine flu-like any other flu we
have been exposed to in our human history-is very contagious and can
pass from human to human quickly and easily. That’s right, in the
same manner as the flu you know: through sneezing, coughing, sharing
drinks, etc. The second reason-and the more troublesome one-is that
once a flu virus has been transmitted from one species to another,
it is in its nature to reprogram and create a new virus-and this
process happens over and over again. What happens in the pig to
human scenario is that once it has been delivered to the human, it
mixes with human genes, and can now make its own cocktail of swine,
human, and any other virus aspect it may be carrying. So, with an
epidemic on our hands, we could have a whole host of different new
virus strains that we have yet to make vaccines for.