Poliomyelitis is an age old disease, but it was only clearly recognized as a clinical entity in the first half of the last century. Until the middle of last century it usually occurred in endemic sporadic form. Small outbreaks were recorded in St. Helena, i834, in England, I834, and in the United States, I843. The first large. epidemic occurred in Scandinavia in i868. In the I890's large epidem...

Poliomyelitis is an age old disease, but it was only clearly recognized as a clinical entity in the first half of the last century. Until the middle of last century it usually occurred in endemic sporadic form. Small outbreaks were recorded in St. Helena, i834, in England, I834, and in the United States, I843. The first large. epidemic occurred in Scandinavia in i868. In the I890's large epidem...

single-celled, microscopic forms nearly 4 billion years ago. These minute forms constituted all life on the planet for roughly half of Earth’s biological history, and microbes have remained important determinants of organic matter production, trophic transfer, and degradation throughout Earth’s entire history, although more attention and research tend to be focused on charismatic macrofauna. It...