It is spread through saliva and other respiratory secretions during coughing, sneezing, kissing, and chewing on toys.

The secretions are often proteins and may act as enzymes that digest some form of food in the environment.

MPO has a heme pigment, which causes its green color in secretions rich in neutrophils, such as pus and some forms of mucus.

Adults Most adults feed on nectar, although a few tropical species feed on eye secretions, and the death's head hawkmoth steals honey from bees.

The microbiology laboratory of the Health Protection Institutes performs the analysis of secretions and stomach contents, as well as of the food remnants that are suspected of causing the illness.

The microbiology laboratory of the Health Protection Institute performs the analysis of the secretions and stomach contents, as well as of the food remnants that are suspected of causing the illness.