Q) Why are viruses difficult to resist as compared to bacteria? Q) How are viruses able to fool our immune system?Please explain the first...

Both viruses and bacteria can be equally difficult for our
bodies to fight off.  They are completely different organisms that invade in completely
different ways.  A bacterial infection is a growth of harmful bacteria in the body.  You
may have heard of E. Coli or Streptococcus bacteria.  We have developed antibiotics to
help us fight these bacterial growths.  Penicillin (from fruit mold) was the first
antibiotic developed and scientists are constantly creating new antibiotics to keep up
with resistant strains of bacteria.  Resistant strains have evolved to survive our
antibiotics and require new, typically more powerful antibiotics to
kill.

Our immune system is the main line of defense against
viruses.  Antibiotics only work for bacterial infections and have no impact on viral
infection.  Scientists have created a new class of drug called antiviral drugs.  These
drugs help suppress viral development.  You probably have heard antivirals are used to
treat HIV.  Common viral colds and infections have no drug treatment, though, and you
will need to wait for your body to fight the
infection.  

When your body fights an infection, it builds
up immunity against that specific strain for future attacks.  (Unfortunately, the body
cannot build up immunity against bacterial infections.)  Building up immunity means that
your body will remember a specific virus and kill it before it does harm.  When we get a
vaccination, we take a weakened or ‘dead’ form of the virus into our body.  By doing
this, we trick our body into thinking that it already fought this type of virus and we
are able to build immunity BEFORE actually catching whatever strain of the virus we are
vaccinated against.

Hope this
helps!