Still doling out bad information?
Simbi Laveau, on 24 January 2013 - 02:28 AM, said:
There are two forms of meningitis. One is not contageous,one is .One is more deadly than the other .
Wrong, meningitis---'itis' is from the Greek and Latin root for "inflammation of x". So meningitis is inflammation of the meninges. The meninges are membranes which cover CNS tissues, made of 3 layers: the dura, arachnoid and pia.
Lots of things (many more than two) can cause meningitis. You can have bacterial, viral, fungal or aseptic meningitis (chemicals, autoimmune, etc). In each of these 4 main categories you have lots of different possible offending agents.
Simbi Laveau, on 24 January 2013 - 02:28 AM, said:
I ,as a paramedic for 17 YEARS...as in years,was exposed to meningitis twice .
So,given I picked up sick people on any given day ,about 8 times,multiple 8 by 20 ,then multiple that by 12,and that by 17,and that's how many sick people I've been exposed to in my life .
So...Two times,in 17 years.
I appreciate you were a EMT, the world needs lots of EMTs--It doesn't make you an expert on medicine, pathophys etc. You learn
BASIC life support skills as an EMT. Not pathophys, not medical micro etc. Hence you were an ENT and not an MD.
Simbi Laveau, on 24 January 2013 - 02:28 AM, said:
Of the two, I was only exposed to the one that's contagious ,once. I also didn't catch it .
So yah,its a,very very rare occurrence to be exposed to meningitis ,and there's no need for a vaccine ,at all.
No nonsense. Again there are many types of meningitis. Viral meningitis, while scary from a patient's stand point, is much less threatening to life than bacterial or fungal. The poo viruses, or better picornaviruses are rather good at causing viral meningitis. This family of viruses includes viruses such as echo, coxasckie and polio viruses. Generally the course of viral meningitis is self limited and doesn't require major medical intervention, sometimes people "tough out" these infections at home never realizing they had viral meningitis.
However there are some viral infections we really worry about causing meningitis. HSV is one of those viruses. HSV 1 and 2 have a different predilection for causing meningitis vs encephalitis vs meningoencephalitis. However that is only a general rule both (as well as other herpes family viruses, such as CMV, EBV and chickenpox) are capable of cause either or. Herpes family viral brain infections tend to have a much more serious course and we tend to treat them more aggressively because of that.
HIV also causes a primary brain infections. Other less common but certainly very dangerous viruses are ones like Dengue, yellow-fever and the bunyaviridea as well all capable of causing meningitis/meningioencephalitis.
Bacterial meningitis (cue scary music) is the one you hear all the fear about in popular media. Bacterial meningitis is very serious and the natural history of bacterial meningitis without medical intervention is.....death. Every time. Unfortunately, sometimes even with treatment bacterial meningitis results in death.
There are lots of bacteria capable of causing meningitis but lets just go through the most common by age group. In Newborns (think 0-6 months of life) bacterial meningitis is most commonly caused by Group B strep (
Streptococcus agalactiae)--which is why all preggo ladies are tested for it, E. coli and Listeria. All but the latter normally come from exposure during passage through the birth canal. The latter, Listeria, can actually cross the placenta as well.
In children the most common causes are Streptococcus pneumonia (also the most common cause of pneumonia), Neisseria meningitidis (meningiococcus) and Haemophilus influenza capsular type B (which we thankfully don't see much of anymore in developed nations because of the HiB vaccine--go ahead insert your rant about vaccines here). That distribution stays about the same throughout adult with meningiococcus taking the lead for a while in early adult life (20s); more on meningiococcus in a minute. As you get to 60s and 70s you start to get more 'exotic' bacteria showing up like gram negative rods (think E. coli, klebsiella etc) and Listeria showing up again.
-Ill save fungi and aseptic for another day.
**You'll notice that:
1. You were wrong about exposure, you're exposed to lots of potential meningitis causing organisms everyday
2.
ALL these infectious causes are actually contagious, not "1 of 2" as you claim.
Simbi Laveau, on 24 January 2013 - 02:28 AM, said:
It's an excuse to scare parents into making them more money,by giving them another unnecessary vaccination .
Uhh no. More to the OP. The problem we've had before this isn't that we haven't had a meningiococcial vaccine, we have. What we haven't had though is a vaccine to capsular polysaccharide B.
Here's the quick and dirty on how vaccines work.
For you body to create immunity to an antigen you need two things. 1 you need a t cell response, t cells are then capable of priming b cells and creating long lasting immunity (read memory cells). 2 you need the b cell response, which is the antibody making arm of the humoral immune response. To mount this sequence of events you need
protein antigen to active t cells. T cells aren't capable of 'priming' b cells without protein antigen. B cells
are capable of making antibody to just polysaccharide (think sugars) by themselves, however you can't establish long last immunity in this way. We get around this by conjugating polysaccharide antigens to proteins to provide long lasting immunity.
The problem with some pathogenic bacteria, such as meningiococcus, is they contain polysaccharide (think sugars) coats which help them evade the immune system by making them harder to phagocytize and helps "hide" their proteins from the immune system. There are different serovars of bacteria (think of them kind like a subspecies) which have different capsular makeups from each other. Previously we have had meningiococcial vaccines against 4 of the 6 capsular serotypes that almost exclusively cause human disease (I believe there are actually 12 or 13 serotypes IIRC)--that is serovars A, C, Y and W.
Serogroup B has many antigenic similarities to human neuronal cells, which has made developing a vaccine against it prohibitive in the past. Which is unfortunate because meningiococcus B certainly causes its fair share of bacterial meningitis (not to mention other bad things like meningiococcial septicemia and Waterhouse-Friderichsen syndrome), however it appears Novartis has found a solution to this problem and developed a working vaccine.
By the way, vaccines are particularly profitable. If these pharma companies were so evil they wouldn't develop a vaccine against type B (which isn't going to make them lots of money), they would just come up with better abx which penetrate the meninges for treating meningiococcial meningitis.
Simbi Laveau, on 24 January 2013 - 02:28 AM, said:
But people on this board with absolutely no medical expertise at all,all know better than people that actually see patients in real ,day to day life.
I'm sorry but again, being an EMT and having an undergrad degree in biology (undergrad degrees in biology really don't teach you anything about medicine, come to think of it an undergrad degree in biology doesn't teach you all that much biology, it does serve as a jumping off point if you wanted to go get further education though) doesn't actually give any medical expertise at all. Really none.
So until you've seen someone literally decompensating on the hospital bed from bacterial meningitis with their blood pressure tanking in the crapper right before your eyes, peticheia popping up every time you walk in to the room and you end up coding them right there, despite you pumping **** loads of 3rd gen cephalosporins in them, blasting them with heavy ass broad specs like meropenem administered intrathecally, pressors, epi, IV fluid boluses etc--Then you can come talk about how much "medicine" you do and know.
Edited by Copasetic, 28 January 2013 - 10:42 PM.