The vaccines are once or twice in a lifetime, but the allergens are not. The MMR vaccine is manufactured using neomycin. The CDC says [1] for the MMR vaccine:
Anyone who has ever had a life-threatening allergic
reaction to the antibiotic neomycin, or any other
component of MMR vaccine, should not get the vaccine.
Neomycin is used in many topical creams and ointments, so there are opportunities to find out that you have a problem with it other than through vaccination.
Also, as you noted, some vaccines are twice in a lifetime. MMR, for example, is given at ~1 year old, and at 4-6 years old. If someone has a life-threatening reaction the first time, the CDC says that they should not get the second dose.
Note that MMR vaccine allergies are very rare, so we aren't talking about a huge number of people who have to go around without MMR vaccination.
Here is a concrete example. MMR is two dose regiment. The current anre recently updated CDC recommendation is that if a child experiences thrombocytopenia within six weeks after the first dose to not give the second dose. Thrombocytopenia is usually not serious - nose bleeds, easy bruising, bleeding of the gums - but since the risk is higher for those that experienced that side effect after the first dose, that is why it has become the recommendation.
One dose of MMR puts their effective immunity to measles at something like 85% during childhood. It varies with how strong the immune system is when the first dose is given, most children get it at six to nine months. At nine months one dose is 85% effective and at 12 months 95% for most infants. It is presumed that the effect is smaller in those vaccinated at six months and those that experience thrombocytopenia and the recommendation is relying on 95% immunization rate for herd immunity. Something like one in 25K children are in this category. There are other categories of people not immunized as well.
Your numbers are being used to lie: You only have to get the MMR vaccine once. But you'll have to get the covid vaccines over and over and over. Just four covid jabs would make these events equally likely. But it's most likely that more than four will be required.
I don't know anything about vaccines or their validity, but even then, the current solutions are a shot once a month or PrEP every day... so twice a year sounds pretty great to me?
Sure once a year for flu shots with different strains. This is the exact same protein again and again. Nothing like this has been done before outside of allergy vaccines from what my allergist told me who is to say at the very least skeptical about it.
The issue with this is that it's the SECOND shot that gives you your long term immunity. If you only get one shot your immunity is allegedly going to wane somewhat quickly.
Not to be pedantic, but is it the case this would only be a single injection? I believe that some vaccines can need repeat/regular treatments over a (relatively short I think) period of time.
If that were the case here it would make vaccination much harder, though still possible of course.
In the UK, according to the released documentation, recipients are monitored for allergic reactions (anaphylaxis) for several minutes after receiving the first dose and staff are trained to react quickly. Anyone with a reaction to the first dose won't be given the second.
You compound risk with repeated exposures. In this case through boosters because the vaccines don't work well enough. It's one thing to get a one time shot that lasts for life than getting 6 shots over 3 years.
Unless you regress into severe Autism, it's very difficult for parents or even doctors to recognize Autism until they are atleast 2 years.
Also according to the schedule, there is no big dose around 2 years. After 18 months, there are not many doses on schedule until children are again 4 years.
Most parents complain about MMR vaccination that is scheduled at 15 months. My son regressed into Autism after MMR. It is true. I hope the world realizes it before more children get effected.
Twice-vaccinated people will have to get a booster shot and there are discussions about a six month expiry date if you don’t get the booster shot.
What happens beyond that we do not know right now since can’t look into the future. We do not know how effective the booster will be in terms of long-term protection.
All of that is not surprising. A bit annoying but not surprising.
Why do you think the vaccine is a one time risk? In the US, you are "highly motivated" in many circumstances to take two doses, and people under 30 are getting booster doses, even though FDA advisory committee members thought that was going to kill more people in that group than help.
Vaccines have a shelf life in your body. It's good to get a titer every once in a while to make sure you don't need a booster. A year would be short though, unless you mean variants/mutations, which would really be reinfection, not with the same thing.
That's not the case with me. I got the shots several days after exposure, and was told that if I was exposed anytime in the next 5 (10?) years I would need one booster shot only.
Also, as you noted, some vaccines are twice in a lifetime. MMR, for example, is given at ~1 year old, and at 4-6 years old. If someone has a life-threatening reaction the first time, the CDC says that they should not get the second dose.
Note that MMR vaccine allergies are very rare, so we aren't talking about a huge number of people who have to go around without MMR vaccination.
[1] http://www.cdc.gov/vaccines/hcp/vis/vis-statements/mmr.html
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