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.
The U.S. Postal ServiceÂ® currently has two 60-cent fundraising or semipostal stamps available for purchase at Post Officesâ¢, online at The Postal StoreÂ®, and by toll-free phone order at 1-800 STAMP-24: the Breast Cancer Research stamp and the Save Vanishing Species stamp.