Along with eggs, I've used previously unopened sour cream WAY (, way) past the date and do the same as you once it's opened. Between the pasteurization of the original milk and then innoculation with good microbes, the lower moisture content and the acidity, it's not a very hospitable environment for pathogens.
Cauterization definition, to burn with a hot iron, electric current, fire, or a caustic, especially for curative purposes; treat with a cautery. See more. Dictionary.com
Inoculation is the act or process of introducing something to where it will grow or reproduce. It is most commonly used in respect of the introduction of a serum, vaccine, or antigenic substance into the body of a human or animal, especially to produce or boost immunity to a particular disease.noculation. Definition. noun, plural: inoculations. (immunology). The process of introducing an antigenic substance or vaccine into the body to trigger immune response against a specific disease.