> Most vaccines do fully stop the spread, even for measles, No, they don't. [0][1] From [1] > Two doses of MMR vaccine are about 97% effective at preventing

> Most vaccines do fully stop the spread, even for measles, No, they don't. [0][1] From [1] > Two doses of MMR vaccine are about 97% effective at preventing measles; one dose is about 93% effective. Obviously those 3% and 7% do spread, even though the symptoms are milder. For the 97 and 93% ones there's indeed very limited (if any) shedding [3]. Now that's holding different bars, because asymptomatic measles infections are less contagious by themselves, regardless of vaccination status, unlike COVID-19 which is still relatively contagious while asymptomatic. So you're attributing a positive point of measles infections as a fault of the COVID-19 vaccines, which is, as you might see, a pretty misinformed take. Also, sterilizing immunity as you seem to understand doesn't really exist, in case that's the misconception you have [2]. In the end it's all about viral load, route of exposure, and level and type of immunity. A mucosal vaccine would behave more in the way your expecting intramuscular ones to work[4]. [0] https://academic.oup.com/cid/article/67/9/1315/5034094?login=true https://academic.oup.com/cid/article/67/9/1315/5034094?login... [1] https://www.cdc.gov/measles/vaccination.html https://www.cdc.gov/measles/vaccination.html [2] https://www.theatlantic.com/science/archive/2021/09/sterilizing-immunity-myth-covid-19-vaccines/620023/ https://www.theatlantic.com/science/archive/2021/09/steriliz... [3] https://academic.oup.com/jid/article/189/Supplement_1/S165/821757 https://academic.oup.com/jid/article/189/Supplement_1/S165/8... [4] https://www.nature.com/articles/s41577-021-00583-2 https://www.nature.com/articles/s41577-021-00583-2