No, the blisters are the body's natural allergic reaction to
poison ivy, oak and sumac plants. If the blisters break and ooze,
the fluid does not contain the oil that causes spreading.
Oil from the original contact with poison oak and poison ivy
will continue spreading (unless removed) for the first one or two
days. If new areas of rash appear after three days, you are most
likely getting re-exposed to the plant oil from contaminated
clothing, tools or even your cat or dog.