I've vaccinated my children but I have since learned a lot and, being pregnant with DC4, I am very concerned that this time I make an informed decision rather than just unquestioningly doing as I'm told.
I have spent countless hours reading papers and research from both sides of the debate and I am still genuinely confused.
About herd immunity though, vaccinations are effective for life, they lose their effectiveness between 2 and 10 years, hence the need for boosters. So unless everyone - all adults included - are up to date on their vaccines and boosters then we are all being exposed to people who don't have full immunity all the time. Also as we know, vaccines don't guarantee you won't still catch the disease. Some people will get vaccinated and still go on to catch the disease and therefore be able to spread it. And what about vaccine shedding where live attenuated viruses are used? There are documented cases of recently vaccinated people infecting others.
human fetal cells from an aborted fetus are used to culture some vaccines like MMR - as are bovine cells, monkey cells, dog cells, pig cells and chicken eggs. I have read that there are none of these cells
Present in the final vaccine as they are purified to remove it. but if that were always 100% effective then people with egg allergies wouldn't have to avoid the flu vaccine.
Also back in 2010 the FDA temporarily withdrew the rotarix vaccine because it was contaminated with the porcine circo virus 1. It was eventually reinstated but knowing that contaminants do indeed get into vaccines I think it is prudent to do your research whether you are pro, anti or somewhere in the middle.