A person in NZ who had two Pfizer shots tests positive for covid. I guess that confirms suspicions that the vaccines may not always provide immunity.
Someone published this video in this thread few days ago. I post it again. It is a good explanation of what vaccines do.
If we take Pfizer's famous 95% as an example. the 95% means that anybody who received two doses and after 15 days have 5% (risk) chance to be infected by the virus BASED on (during the phase III trail) their pattern of life in the specific area where chances of exposure is constant and unchanged compared with people who are not inoculated. If the person was exposed more frequently than the said
chance of exposure (medical staff), the risk would increase. If number of virus carriers in environment increase such as either travelling to high risk area or home region getting more community transmission, that risk also increases.
The video says that these efficacy numbers are not comparable because of the reasons above. IMO, the truth may be that IF put in the exact same condition in phase III trial, Pfizer may not have get much better number than others IF it is better at all.
So it is no surprise a vaccinated person got infected.
Also need to remember that immunity is NOT equal to "not infected". Vaccines only induce anti-body without getting you sick. The anti-body does the work to fight off the virus in your body once you got infected and limiting the virus' ability to multiply to the point of making you sick. It is like breaking the nuclear chain reaction. But vaccines can never prevent you from getting virus inside your body. So IMO immunity is never 100% of anything.
