Which method is NOT a way in which diseases are spread?

High altitude exposure is not a recognized method for the spread of diseases. While high altitude can affect human physiology and may lead to conditions like altitude sickness, it does not facilitate the transmission of infectious agents or pathogens responsible for diseases.

Inoculation, fecal contamination, and regurgitation all involve mechanisms through which pathogens can be transmitted from one individual to another or into the environment. Inoculation usually refers to the introduction of a vaccine or pathogen into the body to stimulate immune response, while fecal contamination involves pathogens present in human or animal waste contaminating food or water sources. Regurgitation can occur in some animals, where undigested food or material that contains pathogens is expelled and can subsequently lead to disease spread. Understanding these different methods is crucial for implementing effective sanitation measures and preventing the spread of diseases.