Staphylococcal food poisoning is called an intoxication disorder because the bacteria produce type III secretion system toxins. This is a type of gastrointestinal illness caused by infection with the staphylococcus aureus bacterium. it is one of the most common food-borne diseases and results from the ingestion of staphylococcal enterotoxins performed in food by enterotoxigenic strains of staphylococcus aureus.
If those are the only answers i would say mutualism
When red blood cells are in a higher concentrated solution, water flows out of the cells faster than it comes in. This results in crenation or shrivelling of the cell.