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I am sorry you are worried about your puppies. How many are there?Parvo would be a concern for me, too, although at 5 weeks they should still have immunity from their mother. Can you take one to be tested? Or you could take a stool sample of one to a veterinarian for testing for parvo.Keep an eye on them to be sure they are all nursing well. Maybe they just have some travel sickness, and will get over it soon. If more of the puppies start to vomit, or if they stop nursing, I would get a test done so you know if it is parvo or not.