Question

Despite all the research, every one of oscarches a call and most of us at
frequenth. Our fare torced one of the contest of all agents
sometimes seems fidiculous Medical science regularly practice transplant
surgery hard schole comtries of scholing diseases such as Typhers in
the Plague But the problem de the common cold is atly difficult and much
has yet to be done to solve it
It is known that cold is caused by one of a member of viral infections that affect
the lining of the nose and other passages leading to the lungs, but the confusing
variety of viruses makes study and remedy very difficult. It was shown m 1950
that many typical colds in achits are caused by one or the other of a family of
viruses loown as Thinoviruses yet there still remain many colds for which no
virus has as yet been isolated
There is also the difficulty that because they are so much smaller than the
bacteria which cause many other infections, viruses cannot be seen with
ortlinary microscopes. Nor can they be cultivated easily in the bacteriologists
Laboratory, since they only grow within the living cells of animals or plants. An
important recent step forward, however, is the development of the technique of
tissue culture, in which bits of animal tissue are enabled to go on living and to
multiply independently of the body. This has greatly aided virus research and
has led to the discovery of a large number of viruses. Their existence had
previously been not only unknown but even unsuspected
The fact that we can catch cold repeatedly creates another difficulty. Usually, a
virus strikes only once and leaves the victim immune to further attacks Still we
do not gam immunity from cold Why? It may possibly be due to the fact that
while other viruses get into the bloodstream where antibodies can oppose them
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the viruses causing cold attack cells only on the surface or it may be that
immunity from one of the many different viruses does not.​

Answer 1

Answer:

what is this not understanding