Get some kind of ID and then ask them where they went to medical school. Ask them if they know what the criminal penalties are for a non-doctor prescribing medical treatment. You can also ask them what the death and injury rate is on this "vaccine". If they don't know ask them if it sounds responsible to recommend an experimental treatment as a non-doctor when you don't even know how likely it is to kill the person. Ask them when the long term peer reviewed clinical trial was done, reproductive toxicity testing was done.