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.
USPSÂ® Holiday FOREVERÂ® Postage Stamps, Book Of 20 Stamps. Make sure you have postage you can count on, whenever you end up needing it. FOREVER stamps allow you to mail on your own schedule, making them great for the home and office alike. Always equal in value to the current First-Class Mail 1 oz rate.