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.
Postcard 34Â¢ | 4 Stamp Formats. With the release of the Coastal Birds postcard stamps, the U.S. Postal ServiceÂ® celebrates four eye-catching birds: the red knot (Calidris canutus), king eider (Somateria spectabilis), roseate spoonbill (Platalea ajaja), and magnificent frigatebird (Fregata magnificens). The stamps feature highly stylized, digital portraits of each bird.