Wanted to share some info I have been reading about regarding a very serious disease. There are so many websites with so much valuable information. Thank goodness for the internet! http://www.workingdogs.com/parvofaq.htm
Parvovirus is a viral disease of dogs. It affects puppies much more frequently than it affects adult dogs. The virus likes to grow in rapidly dividing cells. The intestinal lining has the biggest concentration of rapidly dividing cells in a puppy's body. The virus attacks and kills these cells, causing diarrhea (often bloody), depression and suppression of white blood cells -- which come from another group of rapidly dividing cells. In very young puppies it can infect the heart muscle and lead to "sudden" death.
Parvo" is a virus that attacks the lining of the digestive system. It causes dogs and puppies to not be able to absorb nutrients or liquids. Puppies are especially prone to it because they have an immature immune system. When dogs and puppies contract parvo, they often have diarrhea, vomiting and lethargy. Usually they stop eating and develop a bloody, foul-smelling, liquid stool.
Symptoms usually begin with a high fever, lethargy, depression, and loss of appetite. Secondary symptoms appear as severe gastrointestinal distress, such as vomiting and bloody diarrhea. In many cases, dehydration, shock, and death follow.
Parvovirus is characterized by severe, bloody diarrhea and vomiting, high fever and lethargy. The diarrhea is particularly foul smelling and is sometimes yellow in color. Parvo can also attack a dog's heart causing congestive heart failure. This complication can occur months or years after an apparent recovery from the intestinal form of the disease. Puppies who survive parvo infection usually remain somewhat un-healthy and weak for life.
You can read more info at the given link above.
Forgot to add: my vet informed me that the parvo tests are only about 50% accurate, so even if your test comes back negative the pup could still have the virus. I will try and confirm this via online link. When I do find it I will post the site.
Note: this is a virus, antibiotics cannot help parvo itself, but only can ward off bacterial infections while your dog strives for life.