Is a snail echinoderm

Wondering if a yellow jacket sting leads to a bacterial infection which requires medical attention. I have a very itchy bulls eye around two yellow jacket sting sites on my knee.Antibiotics needed? What is a slugs color? Why do water spiders float? Is Lena Maria a livea nd how old is she? What other things do Ladybirds like to eat other then Nuts and Dried Fruit? What are the primary scavengers in the chaparral? What are the consequences of swallowing a bed bug? Why don't wasps go intowater? Auditing is defined as accounting control? Do caterpillars curl up and not move when they are dead? What kind of food do they sell at Pastis restaurant? What is the Answer to a riddle which begins a moth devoured words? What do you call large mite eat small mite? Can you die if you get stung by a scorpian? Why are bedbugs in your sink and your tub? How does a squid get their food? Do dragonflies eat mayflies? Are rollie pollies cold blooded? What the steps of the incomplete metamorphosis of a dragon fly? Which part of a honeysuckle is the seed?