Sever's disease or calcaneal apophysitis is usually considered to be due to damage or a disturbance in this area of growth. The two growth areas of the calcaneus can be seen on this x-ray. The smaller area to the back of the heel is normal.hat are the long term consequences of heel pain in the child (Severs disease or Calcaneal apophysitis): This condition is self limiting-it will go away when the two parts of bony growth join together-this is natural.
So, a virus must have a host cell (bacteria, plant or animal) in which to live and make more viruses. Outside of a host cell, viruses cannot function. For this reason, viruses tread the fine line that separates living things from nonliving things.
All other organisms are based on double stranded DNA. To reproduce itself, a virus needs to infect a living cell. The genetic material is inserted into the cell, and the reproductive machinery of that cell is then effectively hijacked: the cell starts to produce components of new virus particles.These components spontaneously self-assemble and the new virus particles can then infect other cells, where the same process happens.ach virus can only use certain proteins which influences which cells they are able to infect (a property called 'tropism'). One inside, the virus must shed its protein coat and prepare to be replicated. The process of replication will differ based upon whether or not the virus is DNA based or RNA based.