FREE: US MINT NH SCOTT# 877 Dr. Walter Reed Date Issued: 1940-04-17 Postage Value: 5 cents

The listing, US MINT NH SCOTT# 877 Dr. Walter Reed Date Issued: 1940-04-17 Postage Value: 5 cents has ended.

US MINT NH SCOTT# 877
Dr. Walter Reed
Date Issued: 1940-04-17
Postage Value: 5 cents

Commemorative issue
Famous Americans-Scientists
Dr. Walter Reed
Dr. Walter Reed was a military surgeon who proved in 1901 that yellow fever is caused by a virus transmitted by the bite of the Aedes aegypti mosquito. Following work to prevent the spread of typhoid and improve sanitary conditions during the Spanish-American Way, he was appointed to head a group studying yellow fever in Cuba. His commission disproved the belief that yellow fever was caused by bacteria and found that it was not spread by contact. That information led to the clearing of mosquito-breeding areas in the southeastern United States and in Latin America, and to the halting of the disease.
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--------------------------Mint Stamp Gum--------------------------
: Unused - a stamp that is not cancelled (used) , yet has had all the original gum removed. on early u.s. issues this is the condition that the majority of mint stamps exist in , as early collectors often soaked the gum off their stamps to avoid the possibility of gum drying and splitting

Original Gum (OG) - a stamp that still retains the adhesive applied when the stamp was made, yet has been hinged or has had some of gum removed.

Never Hinged (NH) - a stamp that is in " post office " condition with full gum that has never been hinged .