MadSci Network: Immunology |
Hi Lestz,
First of all, some background information about the
chickenpox. This disease has nothing to do with chickens, it
only makes humans sick. It is caused by the Varicella Zoster
Virus (VZV), which is also known as the Herpes Zoster Virus
because it can also cause Herpes Zoster.
In normal healthy humans that have suffered from chickenpox,
especially when they had a lot of pox (200 to 500 is not
uncommon), the virus will not cause chicken-pox a second
time. Of course, there may be a few healthy people that get
chicken-pox a second time, but this chance is much bigger in
people suffering from AIDS, take drugs because of an
organtransplant or have a less than normal immune system
function.
Directly answering your question, immune cells will probably
live long enough to protect you all of your life.
However, the virus which causes chickenpox can stay in the
body after the pox are gone. It may then cause Herpes Zoster
(shingles) which causes sever pain in the skin.
Now for the interesting part, what are the reasons for
vaccination. Of course, chickenpox is not the worst disease
to have and about 95% of all people in the western world have
been ill with it. For other diseases, like polio or the now
eredicated small-pox, there is more to gain.
However, people with a limited immune system can get very ill
from infection. Moreover, 25 out of 100000 adult people die
of chickenpox and the virus can cause problems when it
infects pregnant women (defective babies).
Enough reasons for vaccination I'd think.
You may be talking about vaccination of people that already
have had chickenpox. Since it is sometimes hard to check
whether or not people really had chickenpox, organizations
may decide to vaccinate all people in a certain group,
without testing for immunity.
Information found, among other places, in the CDC brochure,
downloadable HERE. It's in
Acrobat Reader 3 format, but that reader can be downloaded
for free.
Regards,
Rolf
Try the links in the MadSci Library for more information on Immunology.