Answers

2014-01-16T17:04:38+05:30
VIRUSES ARE MUCH SMALLER THAN THE BACTERIA AS IT IS NOTHING BUT ONLY RNA IT AFFECTS OUR CELL DNA. THE VIRUS DON'T HAVE ITS OWN BODY IT USES THE HOST'S BODY. SO IT VERY DIFFICULT TO KILL THE VIRUSES THAN BACTERIA   
0
thanks
Basically its the morphology of the viruses which makes most of the drugs ineffective.. Virus when outside the host is inactive or rather dead and once it finds a host it becomes active or alive... Its keeps on changing the morphology using the host DNA to multiply. So a vaccine which usually is developed using a component or inactivated antigen has a fixed morphology and that is why effective. While as in viruses since the morphology changes, it becomes difficult to develop drugs or vaccines.
thanks.... :)
Welcome!
u have described it well...