analyse backdrop background bacteria blood blood analysis blue cells cleaning clusters color colour concept contamination culture disease disinfect germs graphic health health care illness immune immunity infection medical medicine microbes microscopic probiotics red sample science sickness slides swab system texture tissue unclean virus green banana banana and ice cream sundae banana split boat bowl dessert dish flavor flavoring flavour flavouring food fruit glass dish ice cream sundae ice cream-based dessert popular sauce strawberry ice cream strawberry topping sweet sweets taste tasty topping vanilla ice cream variations