1 Although any individual may develop a case of pinworms, the infection occurs most frequently in school children between 5 to 10 years of age.  Pinworm infections occur in all socioeconomic groups; however, human-to-human spread is favored by close, crowded living conditions. Spread among family members is common.
Before they start collecting, stamp collectors try to identify the types of stamps. These will help them segregate and sort stamps according to their classification. On its basic concept, there are three main classifications of stamps â special, commemorative, and definitive.
Stamps. Save more with a full range of postage stamps, first class stamps and second class stamps for home or office at the Post Office Shop.This range includes various pack sizes and styles including a heavy usage packs of postage stamps, first class stamps.tamps. Save more with a full range of postage stamps, first class stamps and second class stamps for home or office at the Post Office Shop.