Well, considering the vaccines are not as effective as advertised (we had a measles outbreak locally two years ago, and every documented case was vaccinated), some parents are opting to pass on the shots.
We worked with out doctor for a modified schedule. I grew up with animals, nine shots in a day is way to much and would be illegal in the EU. But because certain classes will not go back to the pediatrician, it is the way the US does thing.
I highly, highly doubt every case was vaccinated. That sounds about as factual as global warming.
No vaccine is "advertised" as being 100% effective. They don't have to be, and everyone knows they aren't. There will always be people for whom a vaccine is not effective, and also people who cannot be vaccinated for whatever reason (too young, compromised immune system, etc.). The whole point of vaccination (from a public health perspective) is herd immunity. Vaccinate the whole population and even the people for whom the vaccine is not effective won't get sick because the virus won't be running around in the population. Of course, when people start refusing the vaccine for some nonsensical reasons, then the herd immunity is less effective and we see outbreaks of the virus.
This really isn't a complicated concept. Does it really need to be said in every one of these damn threads?
When my children were little, those vaccinations were given in groups like this:
1 shot for measles, mumps, and rubella
1 shot for polio
1 shot for varicella
1 shot for diphtheria, pertussis, and tetanus
1 shot for Haemophilus influenza
It wasn't unusual for multiple shots like those to be given to little children all in one doctor's visit. And yet the doctors would become annoyed by those of us who balked at our babies and toddlers receiving so many shots at once.
I always suspect that many of the people laughing at parents who refuse vaccinations for their children don't realize just how many shots are given to children today before they reach age two. When my children were little in the late 90's-early 2000's, they were expected to receive up to 19 shots (for 10 different diseases including booster shots) BY THE AGE OF 18 MONTHS. More shots were given at ages 4-6 and then at 11-12.
Now the number of required shots for babies/toddlers is even higher.