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Sabin, Albert Bruce

Russian-born US microbiologist who developed a highly effective, live vaccine against polio. The earlier vaccine, developed by physicist Jonas Salk, was based on heat-killed viruses. Sabin was convinced that a live form would be longer-lasting and more effective, and in 1957 he succeeded in weakening the virus so that it lost its virulence. The vaccine can be given by mouth.

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Qatar flag

Qatar Flag
The flags of Qatar and Bahrain are very similar, reflecting the countries' historical links. The proportions of the Qatari flag are unique. Effective date: c. 1949.

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