Lymph is a fluid that circulates throughout the body in the lymphatic system. It forms when tissue fluids/blood plasma (mostly water, with proteins and other dissolved substances) drain into the lymphatic system. It contains a high number of lymphocytes (white cells that fight infection).
Puppies normally get their first shots around 8 weeks old, but they can be given earlier if needed (ie with stray, abandoned pups or those who were formula fed). Three sets of combination vaccinations (a shot that protects against more than one disease) given at 3 week intervals. 8 weeks - first round.
Vaccinate your puppy with the parvo combo vaccine at 6 weeks of age, and then again every 3-4 weeks until 16 weeks of age. All dogs, including adult dogs, need at least 2 parvo combo vaccinations given 3-4 weeks apart. In addition, keep young puppies at home until they are fully vaccinated for parvo.